This spreadsheet show that you can tune out knock due to lean and low engine timing conditions.
Thus perfect tuning even included using injectors that were 25% larger then the stock ones.
See how clean the knock count is and at the same time got the timing up during WOT ( TPS >99.5)
Notice how the long term fuel trim is just about perfect when other then WOT.

http://teamzr1.com/cc2.html

This showed that it was not false knock or due to too much carbon within engine.