RightArmBad: have you looked into Trigger Points...These are "points" within the muscle tissue that have been triggered to contract while the brain is signalling them to relax. These are NOT pressure points. These so called points were discovered by Doctors Janet Travel and David Simons in their work in the 1980's, if I recall correctly. Google "Trigger Points." The thing about trigger points is that a single point or series of points in your neck and/or shoulder area can create pains in remote areas like the elbow, forearm, and fingers. I have had similar pains, and worked at messaging my romboids, trapezius,delts, and especially the scalenes in the neck. Use a hard ball (tennis and/or lacross) against a wall to message posterior delts, romboids, supraspinatus, and infraspinatus muscles. Take a look at Clair Davies' books, or other authors, on Trigger points. After a week of these messages, the pains in my forearms, upper arm and hands were noticably reduced. Now, no more pain while paddling, or otherwise.
I have always used a thin, cork bicycle handlebar tape on all my paddles. It provides a very slip-free, softer surface for excellent grip even with a VERY relaxed hand grip. I recently tried an old Epic mid wing (smooth carbon shaft)last week that I had bought from a friend a while ago (without tape)as a beater paddle and I could barely grip the thing with prolonged hard efforts. The cork tape fixed that right away, though I can't stand the old oval grip! Much prefer a round grip... the paddle knows what rotation it likes to dig with a good form. On my newer (2.5 yrs old) Epic mid wing, I've made the loom round with very low density Glass Bubble filler (3M) and epoxy. Topped that off with cork tape, of course. Swings just epic-ly! Now I'd like to try a bigger wing for power training.
P.S. I like to vary my hand position depending on paddling conditions, so I wrap the tape from the point at blade attachment, to just over 12 inches( 31 cm) toward the center. The cork is so light as to not have any noticeable effect on paddling mechanics.