In theory, it will make the cockpit higher.
Higher cockpit = less weight at the front = harder for technical climb.
Maybe thats why we dont see many pro XC rider use riser handlebar.

But,
I use 27mm rise with 50mm stem.
So far dindt have any issue on loose technical climb.
Its all about the weight balancing skill. 

On a steep climb the front may get lifted up.
  Need to move your body over the handlebar.

Yup.
Basically need to balance the front and the rear weight.
Too heavy at front will make back tire lose traction and will cause it to spin.
Too heavy at rear will make front end lose traction and will lead to wheelie.
Plus, we also need to apply appropriate torque to the pedal.
Gearing also important.

Mine is stock 780..
Quite wide at first but after sometimes, I like it.
I like the stability when going fast downhill.

I dont know this before.
163x4.40=717.20
Yup, way wider. 
On climb, I dont notice much difference with the wide handlebar.
But when downhill, definitely can confirm more stable with the wider handlebar.

I think handlebar preference depend also on the type of riding.
On my XC bike, I dont use wide handle bar, I use 720.
Before this, 680. Too narrow for my liking.
780 is on my trail bike.
Wow. Very nice price there... Especially the cable housing.
The handlebar also nice, 35 summore..  

UNO also got fake ?

Haha

Anyway thanks for the info.

not a gimmick for me. been using one for 5 to 6 years now. you will surely feel the difference when climbing, especially on flatter climbs. i'm not a strong climber so it helps me to find a better rhythm and cadence because of how each pedal stroke seems to be more efficient. When i went back to round chain rings for a while, i thought i felt more "wasted" energy when the pedal stroke goes from top to bottom, if you know what i mean. On flats and downhills, no difference or help. in fact, it will feel weird in the beginning.

32t

I have had both before, still macam no difference. Pedal uphill still also very tiring LOL. I had a 28T chainring initially but I killed my crank arm which led me to change to a Shimano SLX one with a 32T (only 32T was in stock). Recently swapped back to 30T because I was having issues trying to tackle the technical uphill with 32T.

I also didn't feel much difference to be honest.
Recently just switch from 32t oval to 38t round chainring on my XC bike.
Apart from the ratio, the pedalling rhythm I cant feel the difference.
At least on smooth road. I rarely do technical offroad on my XC bike bcoz of my crap fork.

I believe first thing you choose a wrong bike to do so.

Use a santa cruz butcher to XC and some more aim for climb. hihihi.

because some bike original design for other purpose.

I dono how you set up your santa cruz but since you said you convert 2x SLX to single ring. Then how about the rear? still using 10 speeds 36T ?

So you expect people guess here and there for your bike set up and advise you how to climb is it?

like this should be ok.

Bike geometry for this bike not good for climb. But if you want then train stand ride in flat road first. See how long time you can stand.

After enough training then just train for up hill.

Certain things need to test it out yourself
Just like saddle.

Why not just buy an oval chainring and give it a try?  If you don't like it.  Can easily sell it off.

Out of curiosity, what is your definition of a climb? Road? Tarmac? Gravel? Offroad? Smooth? Technical climbs?

Yup, it helps with the selection of different stuff to the bike. Even from simple things like how many spacers you have between your stem to what length stem you are using, etc..etc..

ok then don't worry about the chainring or anything else as most bike should be able to tackle those sort of terrain