Just the opposite. More oil equals more power down to about 18-1 plus/minus a little. If the engine has had a couple of gallons through it already then the break in was comlete quite some time ago. It generally takes about 3 hours of running time to do most of what needs to be done. BTW, both of those oils are good to run forever if you like. So is Pennzoil Air Cooled, Motul 800, Redline Two Stroke Racing Oil, and Bel Ray products, and a few others. Just follow their directions. I deliberately did not talk about Amsoil.

Sounds like you're good to go on the plane. Enjoy, it's a very nice flying plane and will do all you ask of it.