I have an HKS ssqv installed on the cold pipe. Everything is working good. My consern is that I’m getting compressor surge at low boost .4 bar and under (not a problem, low load?) I notice that at full boost I get a second of surge as the bov is venting (sounds awfull) the bov is fluttering at the same time I hear surge.
I just spent alot of $$ on all this stuff and sorry if I sound a little paranoid but I want to make sure everythig is good 
BOV vacume source is the top left nipple on the throttle body alone.
BOV is non adjustable new ssqv model. Is there a way to make it softer?