AFR misleading? Plugs tell a better story?

512Stroker said

Just my 2 cents, but you may be running out of fuel on the top end.
What fuel pump are you using? Fuel pressure at rpm?

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Haven’t seen anything going on.
I have an in tank electric fuel pump with 3/8 supply and return loop, regulated PSI @ a little over 6 PSI. Monitored by in car fuel gauge with remote sensor at regulator.