It depends upon what I am painting on the air pressure I use.  But typically I use 15 to 20 PSI, but sometimes I drop it to 10 PSI. 

While I am not using your brand of compressor, I will rarely go over 20 PSI, so your compressor will work fine for me.  

I am not using a Paasche AB, but a Badger patriot and a Sotar 2020.  I do have a Paasche VL however and I don't remember what PSI I used on it.