200 flights is a bit of time for an engine. If run hard it would probably be past its prime. Does sound as though you had it set lean. The higher reving the engine is the more it will lean out at speed. It should be set at least 300 rpm on the rich side more if a high reving engine. 100 RPM rich with nose pointed straignt up. Thats about a click or two on most engines.

Also it sounds like you may be reading manufactures specs. I know OS weignts are without muffler and TT engine weights are with muffler. Thats an ounce or two differance right there. Also TT horsepower figures are lower for engines that are very similar, for example the TT .46 Pro and the OS FX. They should probably be withen less than .1 HP of each other. Maybe OS HP figures are without muffler and TT is with. I don't know but manufactures HP figures are always suspect. That is why the magazines no longer measures the HP figures. Back when they published charts of the HP and torque at all practical RPM ranges. I think manufactures threatened to pull their ads or something because the magazines stoped this practice about the same time.