I've seen different plugs act funny in high compression areas. Its worth a try. And maybe a different coil OEM if you have one.
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"and Bingo was his name-o"
Good calls friend.
Those coils are hit and miss anyway.
Plugs fail under comp and as comp rises it will fade. You can see that in a clear plug tester.
Always worth taking 10 min to think about things...or a couple hours.
Life is a thinking game and nothing more