My vote is for a PX4. My compact models definitely have less felt recoil than a G19. I've never shot a full size PX4 though.
Regarding tendonitis, I had a nasty bout in my right arm/elbow a few years ago. Rest combined with the max dose of Advil was the only thing that helped. After several days of essentially not using my right arm, I experienced a lot of improvement. I ate with my left hand, brushed teeth with my left hand, and drove as little as possible. (My car is a stick shift.). Basically I did everything possible to avoid using my right arm.
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