I've never spoken to PRJ in my entire life, but after reading all his answers on here tells me all I need to know.
I myself put up a thread about boosting an R32 and he chimed in and said that if I wanted serious help to PM and he would create a file for me. For money, obviously, but still, he was more than helpful.
I'm not promoting him or his business, I don't even know what part of the world he's from.
If the case is that I get a throttle cut is just a thought for now.. but it can also be the nature of this engine, poor turbo and so on.
Not only that, you've just commented saying you're not even sure on the quality of the hardware side yourself, and yet you're still asking us for help, and you've STILL not posted any logs.
Im close to wriring my own N75 boost control via ECU the witing is done and output has a boost table. But ill keep that for myself for now.
Why don't you post up what you've done, so some of the experienced members can help you/tell you if what you're doing is right.
If you really want help: document your thought process; what you're changing; logs; more thought process; logs.
Good luck, bud.