Pressure doesn't mean anything. You need to do a flow test on the pump. Although doing a pressure test will sort of give you a fair indication it is still by no means an accurate fuel test.
If it has been on a dyno, they should be able to pinpoint the problem straight away. If not, then they are not doing their job properly. A dyno is there to finely tune vehicles. They should know exactly what your timing is doing, your fuel flow and pressure, your air flow and air temp, your injector duty cycle and injector timing plus all the rest.
I would agree with Bl4cK32 in saying that you have to start with basics. look at the fuel system and delivery, then move onto the ignition and plugs, then move onto your charge air. You should be able to look at the plugs and see what is going on in your engine. If not, pull them out, take a digital photo, post it up and I'll tell you what's going on in your engine.
I still can't believe you have had it to a dyno three times and no-one can tell you the problem.