Dave, I think you're riding position is too high. You're getting the jack-hammer effect that travels up your arms into your shoulders and neck. The solution is lowering the bars. By lowering the bars and decreasing reach you can resolve both the hand numbness and sore shoulder and neck muscles. I think you're frame is a bit on the large side so I would consider decreasing the reach about 30mm and putting the bars as low as you can get them. Flip the stem to the negative side and slam it. Consider negative rise stems like the Syntace Flatforce, FSA SL-K -20, or something similar if your headtube is too high.
Last edited by Clem von Jones; 09-05-18 at 03:32 PM.