Choppy A/F maps as well as timing maps; the progression of jumps the ECU goes through when increasing load/rpm can cause knock as well. HTH.

 

Looking at the maps you're right, it looks like the timing is already pretty low there, and the AFR is also pretty low, at peak its around 8, 9 something :1 Isn't that as safe as it gets? at least in terms of knocking... would taking out a degree make a difference? like droping the time to retard in (-)s. I'd like to bring up the high load AFR up a bit and bring up the timing also, but with current knocking problems at such a safe tune... i guess thats not a good idea.. In terms of smoothing the maps out, any suggestions on how to go about that?