Even with a HKS actuator, you will still hit fuel cut like mad. And I know from experience; mine was set at 10psi but when I relocated my air filter to behind my bumper nothing would stop me hitting fuel cut. I pretty much unwound my actuator to as long as it would go- still didn't stop it! Too much air coming in! Jay over at TGTT had a good idea though, just introduce some back pressure into your exhaust system. So where theres 2 sections joining, add a piece of metal with a smaller diameter hole than the bore of the exhaust; this will increase back pressure and should help limit boost creep, plus it only takes a few mins if you have the right stuff. Failing that, try wrapping 1/4 of your air filter in tape (to limit the air intake). But I tried this and even with 3/4 of the filter wrapped it would still hit fuel cut 'because the filter was just getting ridiculous amounts of air being right behind the bumper!