RE: Tower .46 break in
Maybe just a poor fitting piston cylinder set was sent with this engine. If the engine was not overheated and you had 25% oil, it should have had good compression hot. I think you may need to make a warranty call. Next time don't bother with the heat cycling. It doesn't hurt anything but also doesn't do anything, at least for ABC engines, just run a few tanks through it very very rich. Monitor it to make sure its not overheating. The only advantage to heat cycling is that you don't run it long enough to cause damage from overheating.