Nitrous bogs NEED HELP!

hey guys, I got a 300zx tt with everything done to it, JE forged pistons,rebuilt fuel injectors(stock),rebuilt turbos(stock),full exhaust,downpipes,2 n half " exhaust GREDDY, boost controller, turbo timer,pulleys, blow off valves(greddy), spark plugs NGK. and I am running a 60 shot of nitrous , I just bought a new fuel pump and fuel filter but it bogs like heck and i was wondering if someone could tell me the problem