I've been dealing with this bog/ hesitation recently and i have tried everything you could possibly think of, also i have been getting DET codes some times while i'm in this rpm range which is below 5500. the A/F is spot on, compression is good. i'm running 6.5 to 8 psi with av gas. next i was gonna make sure my TPS is within spec and make sure my reeds aren't gone. i'm pretty much at a loss right now. i did notice that my control box said that it seen 21.8 psi of boost go though so maybe the waste gate is done? ill link a video of what it sounds like.