With out adjusting fuel pressure you will be limited to making fuelling adjustments based on the CO adjuster alone, You NEED to adjust the fuel pressure as Karlos has described. As Stu points out you will be making stockish power without adjusting the fuel pressure properly OR simply melt things. Do you get fast ford in Lux? if you do there were a few issues a couple of years ago that explained the inner workings of the MFI units pretty well..... I think it may even have been written by Stu!!??

On MFI most cars seem to make 180-200bhp with between 16 and 20 psi of boost with a stage 2 t3. I would suggest you start at your waste gate pressure (probably 7psi) and work up adjusting the fuel pressure as you go. Keep RPM sensible (6500 max)

For over 15psi with your car and lack of tools go rich rich, like 10.5 afr. Really you should be at 11.5(ish) at 15psi but I just don't think this will be safe for you with no det cans! You will probably want to retard the timing a little from the stock figure too (to begin with anyway).

You can also take a manifold vac feed to the fuel pressure regulator (the smallish cylinder hanging off the side of the MFI unit). This will help to even things out a little, leaner off boost, richer on boost.

Take some pictures of your engine bay and we can point you at the right bits.

Rob,