My 2300s don't change how they run whether they are on the bench or in the plane, unless you have either a fuel tank problem or a cooling problem. The tank centerline needs to be near (+- 3/8 inch or so) the carb inlet centerline, and it cannot be too far from the engine. there must be enough cooling air so the engine doesn't overheat - especially there must be plenty of opening for the cooling air to get OUT of the cowl. Also a hot glow plug is the way to go (OS f or fox rc long).

Ed