Hi bjfrankl
Do others, with more experience, agree with you? Our planes and engines actually vibrate a tremendous amount. A certain level is considered "normal". That "normal" amount is difficult to describe. Compared to an electric motor, our engines are terrible! I have been in RC planes for about 38 years and I don't even bother to balance my APC props anymore. Occasionally I will see one vibrating above "normal" and I will check the balance. Any of this help you?