HI CORRECT ME if i am wrong -but OS recommends running this engine at 11,500 rpms-to be in the correct power band for this engine-which no one here is doing i see high 9's mid 10' s and even 13'000i am running a 13/7 APC at 12,100 (stock muffler ) and came here to get closer to 11,500 on an APC-had a 14/6 APC on my 60 size ULTRASPORT-it ran bad at mid range which is were i normally fly most ( ran at 11,100 )-but low end was way to rich at that time -and the engine was not yet broken inso it ran poorly with some vibrationhave to try that again with the needle valves set up much more correctly now-is anybody running this engine in the 11,500 range on an APCif so which prop THANKS TONY