u wound ur boost up without a gauge?! jesus u were lucky u didnt melt something lol, who's gonna set the fueling up for u?! Wouldnt bother setting the boost up to 20psi, thats something that needs doing when the rest is being done really!!

The regulator adjustment is done at that grub screw, im guessing if u can see the screw then someone has messed about with it in the past so really u need to fit a pressure gauge onto it so u can see what its currently running and adjust it so its right, if it needs changing oviiously!!! The ecu screw just affects the emissions side of things so dont touch that!!