No expert, however what I have learned through reading and research is that you had one knock event (row 36, -1.4) and the others (row 37 - 45, -1.4 thru -.35) are the ECU learning back to 0. I would try to get a couple more logs in 3rd from 2K - 6K (redlineish) and see what happens. It may just be a bad tank of gas. Mine was doing the same thing around the middle of a WOT run in 3rd. Since then I have been through a tank or so of gas and it has gone away. Hope this helps and I'm sure Bill (cobb tuning) will be around sooner than later with his advice.