If you really want to tinker and lower psi to improve shot quality pick up some low durometer (softer) orings as explained here:
It's 50 cents an oring plus $5 shipping which is expensive but they definitely make a difference compared to stock non broken in orings (don't buy bumpers though). They are not needed by any means but they are a nice touch and make a difference.
one rebuild is:
015 x1 (2 to be safe)
.... up to you how many you want to buy