DO NOT RUN 35-40psi TO YOUR CARB! Thats the efi fuel pressure.
If 3.5-4 isnt enough I would just bump it up a little at a time to see if that helps, also check your timing it could be out of whack
'04 Roush F150 ( totalled while parked
'89 Gt Hatchback H/C/I, 1.6 rockers, 75mm maf, 24lb, 70mm tb, cai, udp, full exhaust, msd ignition, 373s, Eibach Springs, Lakewood 50/50 rears, Adj Rear Control arms, A/C Delete, Smog Delete, EGR Delete,