Not Ranked
You say you can only run 18 degrees of timing, or did I misunderstand? If true, THAT'S your problem. Until you can get enough octane in to keep it from detonation at a real ignition advance, you can't even think about tuning your carb.
But I only hava an anonymous internet opinion.
If it was MY money, I'd be on the phone to Barry Grant & inquire about their Demon lines.
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