Reversing the pistons.
I doubt the slant could reach high enough rpms for the butt-meter to feel a difference.
Mill the head for a little more compression. Easier to do, feel the improvement.
This seems to be the most practical answer. I may look into getting it professionally done. Has anyone done this in the thread? If so, how much did it run you? I’m in Southeast Texas and we only have garage-mechanics, most of whom I do not know. Also, most have limited capabilities. If there’s a recommendation out there, I’m all ears! Thanks!