HFS-6 install on 4.0V6 Tacoma

[Mano]

I just purchased my HFS-6 and im installing it on my TRD supercharged 4.0 1GR Tacoma .. I was wondering on some tuning tips like when should i start injecting the 50/50 mix ..? and which nozzle do i use .. Im currently running 425cc X 6 as my primary injectors and an additional 670cc 7th injector when i start to run out of fuel .. should i start injecting @ around 3psi or should i start it higher ..? Thanks ..Aloha .