Spark Plug Advice Needed

Newbomb Turk said

There is no logic or even reasonable thinking there, but Vizard said it so it must be.

Again, the OP isn’t low on compression and he isn’t over cammed so why 30 at idle? Because Bewy says that Vizsrd says it’s what to do?

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I wonder if it has anything to do with his camshaft formula and all those tight LSA's that he recommends that increase overlap and dilute the intake charge and the cylinders ability to fill at idle needing more initial........

Lean mixtures NEED more timing.