mcx 180 delayed boost build-up

[180 nytro]

Hey guys, I have a nytro with a mcx 180 kit , and I had noticed the last time I rode it that when I'm at mid throttle or not into the power, then I open it right up it takes a lot longer than usual to build up to 6 psi, but if u open it up right from a stand still it builds up instantly? I do have the lighter spring in the bov, ?

What could be wrong?

 

[Triplerev]

Check for exhaust leaks