have a read of the powerfc faq in my signature
covers all of the common questions and howto's for working with knocking problems.
i don't believe its a any of those and just a few points have some timing thats a bit too advanced.
in the warmer weather its knocking a bit more and also when you place the car on load, typically when rpm is low and you up are going up a hill youll find via map tracer
that you may be going into map areas that you dont often go into, or that haven't been tuned correctly
as its hard to go over the entire map on the dyno and cover all scenarios, so it could just be 1 or 2 spots with a bit too much timing