[s15 sr20 guy]

I have a s14 sr20 and i am having a little surge problem. I am running a Sard r2d2 bov. Running my car at 7 psi everything is fine and there is little to no compressor surge. When I up my boost to 12 psi i I am getting compressor surge when i shift around the 10 psi range or higher. the compressor surge is very noticeable too. The weird thing is that my bov is still blowing off. i tried adjusting the bov softer but it didnt seem to help. do i need to set my bov to be tighter? what should i do? by the way this is my first turbo car. i also looked though alot of the threads and none of them seem to have my problem because my bov is blowing off fully but its surging to.