Hey AJ,
Just replaced my rear jug, lifted heads front and rear, all new gaskets, O rings, new piston rings front and back. Warranty on all. Found oil leak before, and when lifting off cylinder, a lot of oil pooled. Oil found its way down cyclinder studs. Filled compression cylinder under piston, and reduces power. Hope this fixes it, but don't hold high hopes. Some experts say gasket design is flawed, the old, and the new ones. Takes a long time to get a true fix. Oil leaking out the rear of the rear head gasket, means a LOT of oil already found its way on the inside first. Let me know how yours is holding up over time, and I will do same. In the meantime, I did notice more power, makes sense since all that oil is off the chamber.
Ron
Yes Harry, the rear jug was replaced as well as both front & rear gaskets.