I had a quick look over your log. I agree it definately looks like there is some mild knock in the 5000-6000rpm region on at least a couple of cylinders. The easiest test is generally to pull 5deg out of the cells around that area and if the noise levels flatten out then it is a strong suggestion it is knock.
The delta threshold is getting tripped more often than it should be and in some places it looks like it is not getting tripped when it needs to be so I think the deltas still need a bit of work. Add these channels to you log will help see what is going on.
I will attach some example settings from our 2.0 JDM V11 STI. Im not sure how relevent they will be but it might give you a feel for the trends. There are definately some of these settings I havent experimented with much and probably need more optimising one day but the knock control in this car works well and can be relied on as is. It is a bit erractic at around 2000RPM no matter what I do which is why I have it disabled below 2500.
I only use ign trim as fuel doesnt seem to do much to supress knock in piston engines, it works well in rotaries though which is the main reason it is there as an option.
