I have never had a problem with flying a plane with the recommended engine on the nose. I think manufacturers follow their CAD designs to a tee to prevent some numb nuts from coming back with a law suit about how a set up was way over powered.

I never was into over powering a plane. I always thought why by an engine that you can only fly at half throttle with through the entire flight ?

Well after getting my OS .70fs and first putting it on a .40 trainer and then into a .46 CHIPMUNK , I have seen the light [sm=idea.gif].

I now think of over powering as an security blanket for not crashing.