I have just installed an HKS SSBOV on my '94 BPU car. With the stock BOV, the second turbo came on line at about 4500rpm and pulled hard. Since I have installed the HKS unit, I don't feel the second turbo work until 5500rpm, and it pulls much weaker. Haven't installed a boost gauge yet, but I'm wondering if I have a boost leak. Should I tighten the adjustment screw? Do you think it is too loose and is opening under boost? Thanks.