Compressor surge on 50 trim?

[CarPsyco84]

I'm using the line that was originally used for the stock purge valve, It definatly is related to the slow spool up, cause I tryed letting off soon as it started doing that, then hitting it again and it was fine... Pretty sure its the BOV but why only on slow spool up? cause it will sometimes start doing it below 20psi, and it has held 35+ psi on the car when my boost controller was set a lil too high...