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The problem is the afc and the fact it wanted to make too much timing too quick. After 6000 rpm the timing went up and down in 1* increments
The stock timing map, on the highest load level (which you DEFINITELY are stuck on..), makes a huge jump from 21* at 5500 RPM to 24* at 6000 RPM. This is probably the root of your problem.

However at the airflow numbers you're probably seeing, the stock map is probably too aggressive all around. Time for DSMLink, or some other form of timing control.

Now, I'll have all kinds of time to talk about DSMs, because I won't be busy fixing mine!