It is not a question of rpm. It is a question of speed. The other deposit does not vibrate at all. And time ago didn't do that.Every engine has a rev range where it vibrates more than normal. Every engine has a rev range where it is happy and smooth. You need to select a gear where your rpm’s are in the happy engine range for the speed you are going. You do not have to ride in high gear when it results in excessive vibration. Either select another gear, or install a sprocket that results in your engine being in the smoothest rpm range for the type of riding you do.