Yes @dwRK I used to consider myself as being not a fan of tyre alignment and rotation till todate .

Subsequent to my previous wheel alignment 3.5 years ago post front axle tyres replacements ,about a year later my mechanic did advise me to do another wheel alignment after changing some front suspension parts (not sure whether it is cheapo absorbers or absorber links etc ) .

However as typically , I did not follow through with the alignment advice as I felt vehicle handling/cornering was ok and fine .

This may help explain why about a year ago , I began feeling unsteady/unstable steering wheel during cornering into Right ...... probably caused by and related to out of spec alignment angles .

If not for the recent 'major' front suspension parts replacement and I was troubled by the real 'lousy' right turn cornering and pulling left , I wouldn't have visited this alignment shop .

As regards current alignment values as being too neutral .... easy to drift and unstable at high speed .......
I think you could be right about it including the marginal assymetric camber angles not being a problem .

Do you think an inappropriate or less than 'ideal' non-adjustable front caster angles could lead to my current 'complaints of annoyance' ???  .

I think you are right in suggesting the 3.5 year olds 'worn' front tyres could cause pulling to one side here ......

Unfortunately caster angles are not being checked and measured here , accepting the scenario that Caster angles on Avanza can't be adjusted .

On torque-steer / acceleration/deceleration  , I would need to google to read up more about it and appreciate your highlighting of it . 

Oh no ... the pulling left phenomenon that I tested occurs at straight ahead driving at a constant road speed of 80/90/110 km per hr , not really during acceleration/deceleration , if that matters .

Quantitatively , I would say my Avanza pulling left fully occupying/blocking neighbouring lane completely in about 6-8 seconds after hands off steering wheel whilst traveling at 90 km/hr .

Zeng...... off topic abit but still related to suspension. How's does your new KYB Ultra compare to the stock absorbers that were changed out? Stiffer?

For now, I'm a bit 'suspicious' on one aspect of the spec limits displayed though Toyota should have done extensive tests/research to come up with this limits .....

Why would Toyota specify such 'big' +ve camber in 2007 Avanza 1.3 L ?
Is Avanza 1.5L or of different gen specify same 'big' +ve camber ?

Not driving an Avanza, but rented 1 b4 in Langkawi    As debcribed by you above, its suspensionsetup can be quite harsh when empty/1person. Much quite comfortable when fully loaded (was loaded with 3 fatsos +2 midgets)

I guess it was due the long-ish suspension travel of the front setup on the car, since this is supposed to be a people and/or goods mover.

As McPherson suspension swings up, you gain negative camber due to the geometry movement. Maybe Toyota wants to keep their reputation by limiting -ve camber gain and thus saving its users "unnecessary" tyre wear, when the car is moderately loaded (most probable engineer's goal).

In your case, maybe you were driving alone most of the time. So maybe dats why you feel the suspension setup is shitty.

we experienced petrolhead just worked with the alignment guys to set to whatever our fancy...  no need rely on machine database

new tyres camber sometimes -1.5 to have some high g fun... old tyres -0.5 to even out wear

Thanks .... a good ballpark range of camber angles to work with , I suppose  .
In your experience , is -0.5° camber edge wear easily noticeable by eye sighting or it can only be felt by running hand fingers/palms over tyre surface to 'feel' the wear or no edge wear indication at all ?
A -1.5° camber would give visually noticeable wear indications I guess ...... what about -1° camber wear , can it be seen with naked eyes too ?

this was my front tyre... inner wear from -1.5 camber/toe in, outer wear from hard cornering... overall quite even wear as you can see from center treads

noobs might think this is under inflated tyre so the wear is on the edges... it's not...I pump it 36 psi, lol

this tyre done over 70k km, and rotated twice... my setting now quite neutral about -0.6 to get more center wear whilst waiting for new tyres launch this year...

Brilliant ........ a picture speaks a thousand words .

You gave me a superbly useful idea here in taking pictures periodically on tyre conditions with attached remarks (as I did with my engine oil blotter spot tests ) ..... as a way of observing and keeping track of developments surrounding alignment angles selection choices and and tyre  wear trending .

The inner edge pattern has a marginally great wear than that of the outer edge . Granted your specific driving pattern and respective proportion of mileages on straight ahead vs cornering/curved roads , I would speculate this inner edge wear is solely attributed to the 'excessive' camber angle of -1.5° , assuming your toe in has never gone into negative toe out during the 70K km usage AND underinflation has never occurred which I suppose is highly likely  . Not sure if you would agree with .

On outer edge wear , I beg to differ from you and wish to argue that it is not contributed by hard cornering as you proposed but 'solely' caused by toe in over huge amount of straight  ahead driving ? I am ignoring quantitative amount or causes of wear within region 5-10 mm from the outer edge sidewall .

dwRK, can you share the amount of toe in as 'installed' then ?

As regards pumped pressure of  36 psi , may I know what is the factory recommended psi for said vehicle ?

Update :

Redo/readjust (foc) Front wheel alignment to :

Camber :
LF -0°20' (from +0°15') ;RF -0°15' (from -0°15')  ;

Toes :
LF +0°07' (from 0°00') ; RF +0°05' (from 0°00') .

Tyre pressure : remains same at 40 psi all round .

(Note :Sorry, miss to take pictures on computer screen . The tyreman flips the screen too fast .)

Pulling left phenomenon still remains , but much improved and better than before . 

Instead of swerving to fully occupying left lane in about 6-7 seconds after hands off steering wheel previously  , it takes a longer time now at around 10-12 seconds at 90 km/hr ....
but it is still obvious .

But now unfortunately one new problem crops out . Previously steering wheel is straight when driving straight ahead , but now steering wheel is leaning to right when driving straight ahead .    

Any comments , folks ?

They didn't straighten/centre the steering perfectly before locking it for alignment.

toe is usually very small... around 0.3~1 mm... don't need much & I don't pay too much attention to it, just making sure its +ve or -ve as appropriate

my tyre wear actually suggests my -1.5 camber is not enough, should not be wearing the outside edges too much but I'm reluctant to go higher. fyi hard cornering wear both inner and outer edge...depending on inside/outside  wheel... and rwd cars wear slightly different from fwd cars

my car spec is 34... I pump 35-36 for better handling because I have a soft sidewall tyre

Yeah agree that the 0.3~1 mm toe is very negligible indeed .

This value may translate into 0.05-0.10° depending on tyre size .If it is a -ve toe out (instead of toe in) and in a RWD then it may have no role in your tyre outer edge wear above . In this scenario inadequate -ve camber of -1.5° would likely be the culprit for the outer edge wear .

Btw, is the drive a RWD or FWD ?

Yep agree that both inner and outer edge wear could happen to inside/outside wheels  in a hard cornering indeed .

Hmm... -1.5° camber may be too negative a value for an Avanza that allows up to a 'minimum' of  -0.25° (aka -0°15') . However ,I may consider more negative camber than spec should my tyre wear pattern 'allows' it , who knows .

At 36 psi for a spec'ed 34 psi application, it would likely rule out 'underinflation' issue in assessing your tyre wear pattern, I suppose .