At risk of making this over complicated, the OFT could actually assist in this, though the tune itself is possibly unrelated. If are looking at or logging, please let me know what your RPM, Throttle %, FLKC, FBKC, IAM, STFT and LTFT are.
This will tell us if you are having knock, your fuel trims for short term and long term, What throttle percentage, and RPM you're at.
On the other had, usually if you were knocking bad enough, you'd be having other CEL, so it could be the sensor itself.