I believe you're logging knock sensor volts. Graph them like you have the rest of the data and look for patterns. The upper RPM area seems to want to show a bit of STKR on your logs. Previous logs were showing 1-2 deg STKR, but if you removed 1.5 and still see 1-2 then it's likely false knock. To test I'd remove 2 more deg, retest, and compare knock sensor volts and STKR readings.
I found patterns in mine and had to tweak the knock sensors just a tick to get rid of it. Doesn't take much usually. I started by setting my knock window to match that of a 2019 Redeye factory calibration at 42.
On my car it'd get knock at 2,000 rpm and 4,000 rpm no matter what. I could set it to 0 deg of timing and it wouldn't matter. Josh from Flatout gave me the tip on putting knock sensor volts in the graph to look for patterns and sure enough. I'd see 1.5V on the knock sensors right at 2,000 and 4,000 for a blip every time. In the end it was the increased noise from the pulley on the supercharger and I just had to adjust things accordingly. When you get to that point lemme know and I can give you some tips on how I did it very conservatively.