can describe the taste?

AFAIK, Ethiopia beans has quite a body, i bought a bag of Dallmayr Ethopian Crown last year, pretty good just that it was a bit sourish when it got home...
my mistake for bringing it back in grounded form

Haha.. espresso has sourness.. but 12g for 2oz? Are you aiming for double? Cuz 12g is still around single shot area.. unless you're going for Italian doppio which is 14g. If you want more body, let the blonding go a bit longer.. that will add some bitterness to it.

Some machines will recognize 12g as double.. but for most, 12g is too little for a double.
Blonding is the end part of the extraction.. whereby the thick and syrup like crema has turned yellowish or towards translucent. This will carry bitterness.. beginning of the shot will have more acidity, then middle is more on sweetness..

I'm using a 58mm PF and I weigh my beans.. for my double, I normally use 18g. For some blends, with only arabica beans.. I will use 20g because it's sweet.. so I prefer to have more body by up-dosing..
As for pressurized PF, the only thing it works good is the pressured crema 
So far, I tamp around 20kg of force.. but I've tried light tamping and still get the right extraction.. Now I normally just level the coffee by tamping and polish..

Hi, for my machine the espresso flows out at around 8-10 seconds. 15-16g per dose , output 45-55ml of espresso at 27-29 seconds.

So I guess you could wait for awhile more to see whether the espresso flows out and time the whole extraction then adjust your grind or dose.

Pressurized portafilter cannot use the 25-30 seconds rule
Can only go by taste

My bad, as far as I remembered before I depressurized my portafilter on the poemia , I had espresso extraction at 15-17 seconds for 50-70ml at 14g of coffee.

You can updose with presurrized filter just don't tamp too hard just flatten the surface of the coffee in the portafilter.

What machine are you using?

Cheers!

Seems like your machine's choking.. your grind is still too fine.

I doubt there would be any side effects.. but don't always choke it
Finding the right grind size might choke your machine once in a while.. but for home machines, not that sure if long term will hurt it.. for my machine, we need to backflush everyday so.. that is for 10 seconds.

where did you buy the maker?
cant find any china brand machine..
mind to share? 

ok..thanks for the info...
let me go search for it.

Did you lock the PF tightly in place? It shouldn't leak from the sides unless it's loose or gasket not fitting properly.. If the grind size is too fine.. at most you'll be choking the machine with nothing coming out..

After testing out a couple of milk for steaming, found that no milk is the same.

GOD TIER
- Farmhouse fresh milk[pink package](*Most expensive milk, best microfoam)

BEST VALUE TIER
- Magnolia fresh milk (*Good amount of microfoam, decently priced)
- First Choice fresh milk (*Good microfoam consistency, decently priced)

SHIT TIER
- Happy Farm Fresh Milk [2L bottle with pink cover] (*Cannot get microfoam no matter how you steam it)
- Dutch Lady Full Cream Milk [blue packaging] (*Steaming this milk will result in gigantic bubbles appearing after steaming)