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With ignition sorted I would move to mixture. Laser thermometer each exhaust port/pipe when the issue is present to narrow down which cylinder is offending. Check the plug, verify with color tune. Could be an air leak/bypass screw out of adjustment. I'd have the vacuum gauge that sits atop the stack on each cylinder also to make sure they're balanced.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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