You should be running close to what pressure you want so that gate doesn't have to regulate large amounts of air.
A 13-15lbs spring would work better for your situation. However, 38mm may not be up to the task. I have 44 on my GTX 3076r and I don't have creeping issues. I'll spike past set pressure but it settles within 1 psi to desired. I'm also running a PeakBoost manifold.
With that said, I'd start by changing springs out to see if that helps.
Anyone have any insight to the Spark plugs I requested earlier?
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