Here is part of your problem. You just capped off a very important part of keeping your crankcase depressurized. Plus it looks like a towel with a clamp, besides being ghettofabolicious you are leaking metered air when your not in boost.
In this picture you will see how it should be done properly, aka how Nissan did it OEM too. The 5/8" hose goes from valve cover to the turbo intake, this way turbo creates vacuum to suck out the pressurized blowby. Since the 5/8" hose connects after the MAF, it sends metered air past the MAF so it doesn't recount it.