Have a good look at you injectors and compare with photos on google images.
If your keen, take out the fuel pump and do the same.
If you spend a bit of time reading : http://www.skylinesaustralia.com/forums/topic/55845-rb25-turbo-upgrade-all-dyno-results/
You will see what is actually needed to make power, and what does nothing.
What i learned is if you have a bigger turbo and want more power, you need more fuel. The standard fuel system only has enough for a slightly bigger turbo, and small power gain.
And you need a computer to run it of course. A Nistune is suitable for anything thats not making heaps of power. ( for rb 25s i dont know exactly how much )
Almost anything else you do to the motor wont give more power, like wanky bov's etc. But things like an upgraded cooling system can keep it in good nik longer.
Dont forget the cheap effective things like exhaust and intake, though you may have most of that done already.
Personally id make it run nice with the turbo you have, and concentrate on handling.
Theres a lot of bits and pieces to make it handle good. It can eat up a lot of cash.
I couldnt use all my 180kw because my diff was stuffed, no point having power you cant use.
Ps: im jealous of your wastegate actuator, thats nice and simple, reliable and adjustable.