Speed is not bad. I would check timing for your vibration issue. I don't have any vibration other than good vibrations when my arrows are going in the middle. Honestly been one of the best bows I have shot and tuned. I like everything about the bow. Don't be concerned about the speed, you have plenty. Just think about arrow placement. Only thing you can do is max out the limbs and shoot a lighter arrow that tunes to the bow. But honestly you have a great set up!