That's too much prop and nitro for break in. This engine runs well on 5-15% nitro, why run it on 30%? I don't think it was designed to run that.

Running high nitro you have to force that much more fuel thru the spraybar to get some methanol to the combustion chamber.

Well, between the prop, nitro, Jett muffler, not ensuring that the engine is heat cycled and run in per manufacturers specs, no baffles in the cowl, if you cook the engine don't blame OS.

Best of luck to you.