you have a broken BOV. get a new one
HKS SSQV will cause turbo lag between shifts; there is no recirculation. I had the BOV and it was cool for the sound, but definitely made the car more sluggish after a shift. I sold it and put the stock one back on. With the silencer removed I could hear the turbo more and also the BOV, which was satisfactory for me.
The only time you really need to replace the BOV is when you are pushing so much boost and the stock BOV can't hang anymore.
Save the money and spend it on a downpipe