Achy feeling in arms and hands says to me that your weight is too far forward. Again, the reach problem.
My slight reach problem and forward weight imbalance gives me pain in my left elbow every time i ride. No matter what. Even when my core strength is better, the elbow still hurts the longer i ride. Stops hurting when I rest, comes back again after 10 minutes of riding. It's not going to go away on this bike. I've learned to live with it, but am hoping my new custom bike will cure that by having my balance better centered.