On my Laser I used to run a hacked MAS with the scilencer removed, upper honeycomb removed, but I left the adjustment screw the way it was. I ran 16-18 psi.
For fuel system all I had was a Fuel pump. I had other mods but nothing that I think would lean it out.
Worked ok for me, all I had was a A/F Ratio gauge and it was in the green(rich) side of the lights. Drove it like that for a year and a half.