I have had no problem with vibration. I ran the engine on the ground for 3 tanks to break it in, then adjusted my high and low ends of the needle valve. The Saito puuuurrrrs when at idle, with little or no vibration. Another member at my field suggested the breakin scheme, and it worked to a tee. Thank goodness for the elderly!! For they are wise. I am out of town, and not sure which pro size I used, but I do know it is a carbon fiber prop. I may go to a wooden prop later. I hear they do not flex as much. I believe my prop is a 16x8. I will check and let you know.

Good luck