I know there was some discussion about this before, however I think I understood that you have a Race ECM on the bike with no TPS input, only CPS. Yeah?
The ignition units on carb-ed bikes have a VOES, so the ignition unit knows when the throttle is closed and hence when to give it a bit of advance.
Your map looks like this:
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With no TPS, you will be at 0 TPS regardless of throttle opening, so a whopping 45 deg advance from 3500 upwards on WOT, no wonder it knocks... Bet it runs rubbish too...
What would I do?
Well, firstly I would get a VOES and plumb it in like this:
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Then I would remap the ignition like this (and do the same on the rear):
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Or of course, fit an ignition system into the cam cover (less carve up of your wiring loom), like a
Dyna 2000i