KR between 3500-4000rpm

Been trying to figure this out for a couple months now so figured I'd see if anyone has had the same problem. Tuner(Alan at Edge) is pretty sure it's false knock but I can't seem to find the source, and Ive gone over the whole bay without pulling the intake manifold. It typically peaks at 2.1 and then tapers off quickly. Seems like if it was real knock it wouldnt go away. Did a compression test and looked at the plugs yesterday. Compression test is good(all ranged from 175-185). Plugs all looked the same, but looks like they got pretty hot and have a bit of carbon buildup(pic attached). Alan recomended replacing the plugs and gapping them at.026 so i did that. Havent taken a log yet, but driving it around I see the the knock is still there by watching the AP. Attached one of the 4th WOTlogs below. TIA for any help

Here is my mod list:
.Corksport CST4 turbo
.Cobb electronic boost control solenoid
.Corksport SRI and TIP
.Corksport fuel injector seals
.Corksport BPV
.Corksport throttle body
.CX Racing FMIC
.Cobb accesport
.Damond motor mounts
.Damond dual oil catch can
.Damond EGR delete
.JBR balance shaft delete/oil pan baffle
.Supertech Pistons 88mm bore
.K1 Rods
.Mahle clevite rod bearings
.NGK 6510 iridium spark plugs .024 gap
.Corksport short shift plate
.Corksport HPFP internals
.3 inch turboback exhaust, no cat, no resonator, Magnaflow mufflers
.Sure short shift plate
.H&R lowering springs
.KYB front struts

 

What fuel are you tuned on ? Do you have access to ethanol are you able to toss in a couple of gallons and see if the knock goes away.

 

Tuned on 92. Had mixed results with octane booster getting rid of it. Its doesnt happen on every log, comes and goes. A bit that i left out is it started happening after i replaced the AC clutch and coil. However I also didnt do any 4th WOT logs until that time either