i have a gms .47 on a mojo 40.....i would trust the engine with my life in a hover...the thing never dies
i also run 0% nitro and 50/50 castor synthetic mix...but it was just as reliable on wildcat 10% nitro
try leaning out the low end slightly (but to me it sounds like your setting the high end too rich.. being cautious... which is messing up your mid range...but i dont know for sure since im not their)
set your engine correctly, like you would for any other plane, do not richen the high end because it is a 3d plane...