I'm with cyclic, A plane running lean or a new engine will run hotter and often fall off after full throttle. Meaning the rpm will climb up then fall off a TAD indicating rapid temp increase from being new(tight) or lean and things tightening up. I have seen many new ringed engines do this when you(and me) get in a rush to get her all broke in and lean it out a little too early. I was always told if you can smell "Hot" it's too hot. Like shutting down and hearing fuel sizzle in the carb throat.[X(] probably an indication your running too hot.