if removing your bov gave you an increase in boost (and of 4 pounds) then it is leaking like a b***ch
i would put the bov back on but dont plumb up the vacuum line that way its leaking will keep your boost lower enough to do a full boost lift off and wont dump the boost in the process;)
then if you still dont get the chuff..chuff..chuff, you know you have 2 leaks:p
yes you do;), my turbo and intake side is stock, with a k&n panel and the surge is loud even sat in trafic, slightly quieter with the stock filter but still there and the HKS filter is inbetween the 2 volume wise;)