I think I would try leaning it down at light part throttle cruise under 2500 RPM to 14.8 AFR or even leaner scope wrench
12.4 to 13.2 it great for best power at WOT or more pedal pressures but less fuel AFR at light throttle high manifold pressure seems to be better to me twocents scope twocents

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)