Back to the OS LA 40 running rich, mine always smokes a little and always covers the plane with slime. I've gotten used to it and reckon that it's not doing any harm to the motor (which probably can't be said for the plane). It's definitely 2 stroking so not too rich. Oh and on the subject of prop sizes I use an 11x5 on my trainer, gives it some poke without revving it's head off.

Andy