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Misfire?
I read a few more catchup pages bit still a way to go.
So sometimes there are no misfires, sometimes there are? What does your dyno man say? Air leaks?
Are you using a standard heavy flywheel?
Occasionally you can get these random misfires from poor ignition/master switches though that is unlikely to provide such plug readings.
Can you get some ignition traces on a scope? Or other data logging? A Pico would track them. Another challenge for you!
A mobile diagnostics guy might be worth a try. I use a mobile guy for all sorts of stuff. Smoke/leak testing can show up unexpected leaks.
Ignition & wiring faults - the Pico is brilliant.
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