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Any EI which kicks back like you're describing must be set up wrong?

Fully advanced should be between around 29-32 degrees, so the yellow curve on Greg's graph would apply.

Have your settings been confirmed via a strobe?

Norton primary case degree displays can be a few degrees out, so need to be confirmed with a degree disc, but even so, to be getting your symptoms it sounds way out.

I had similar symptoms once before I remembered the cam rotates anti-clockwise...