still having boost creep
 

Just wondering if anyone with an open exhaust that has also ported the wastegate still has boost creep. I recently ported my wastegate (as large as I possible could) and still had creep. Then I pulled off the GT Spec exhaust and temporarily swapped it with a friend's 3 inch exhaust (in hopes that going from the 3.75 inch GT Spec to a 3 inch exhaust would possibly create enough back pressure), but I'm STILL getting boost creep. The only solution I can think of now (short of ditching the MP) is a restrictor plate. Anyone else had these problems EVEN after porting the wastegate?