Hi 14-0 (did you have a good football season or something???:-)
My dad, who started life as a framer then to a carpenter then to a contractor, swung a hammer the better part of his adult life. He went from a 22 and 28oz Vaughn to a 22 oz steel stanley then back to the wooden handled Vaughn's. The reason: tendonitis in his elbow, probably not unlike yours. He firmly believes that the steel (and to a lesser extent, fiberglas) handles give very little on impact of the hammer's head, thus transmitting the shock energy up your arm.
My brother ( a carpenter) and I swing all 3 types of hammers without problems (yet!), but then we don't do it as much as our dad, and with pneumatics, we're doing it a lot less.
I'd recommend you stay with the longer wooden handles.