A final thought is hand position. How do you rest your hands on the hoods, on the curve, on tops, in the drops? Do you grip right across the ulnar nerve? Some riders suggest that you "karate chop" the bar instead, by resting on the outer meat of the palm with the wrists in a neutral position, as in a handshake. Resting lightly, ready to move to the brakes when needed.
I have found this to be very comfortable for me, and I've done it for the last 20 years or so. YMMV.