No amount of carb tweaking will get rid of pinging.
I'd be looking at whether or not you've got 11:1 pistons or something more radical. Should not ping dramatically at stock timing with 11:1s although a 2 degree retard is advised. How are you retarding the timing yourself? Rotating the backplate? If so, I'd return to stock alignment and see if that is better or worse. Somehow the rotation thing didn't work out for me and I ended up going with the DP ignition modules.
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