Well to be honest I think you need to open that thing up a lil before pushing lots of boost. Get yourself a downpipe and exhaust
you could tune the car at 24 on pump and with 50/50 mix I'd say 26-28psi would be decent
On my old motor and when I had a evo 8 turbo I was pushing 32psi but the motor that's in car now and the 9 turbo I'm only at 28psi right now