If I where you I'd spend some time and rework your timing map. Make it easy on the eye and visualize what the car would be doing.
Figure out where you have the peak load and build the timing map around that. Example 14 degrees at peak and goes to 19 degrees at redline.
You should also have a nice fuelling map that address all corners of said map. Maybe you are hitting a spot where its lean for that split second?
Also what is the CL/OL delays at? if they are stock values then you will be going lean into boost and you could knock.
I'm new to this and have my set of problems, so take what I say with a grain of salt.
That's my full timing map with zero across the board for timing advance except on the lower bottom left corner (did this not to get any problems with some mystery counters etc). I don't have my knock sensor hooked up and listen via det cans.