14-15* is the max KR. I'm talking actual timing. I took his timing table and retarded the area where he was getting all of that part-throttle KR to or close to 0* and still got KR, so I figured it wasn't true knock. When I disabled the EGR valve, I was able to restore his timing table back to where it was with no KR.

Go pull the plug on the EGR valve and take the car for a drive. Your SES light will come on for the valve, but watch your KR and see if it goes away.