I would try one of the Pro-Kennex racquets for softer feel in the arm. I would recommend the Q Tour or the Ki-5. I haven't tried the Q5 yet. It says its stiffer in the specs, but I have played with other Q models and they play softer than their stiffness rating indicates.
Head Men's Tennis Coach @ Yeshiva University. Pro Kennex Ki-5(R) & Gamma RZR 98 (L)
Dunlop Black Widow 17 (63lb) Babolat N.Vy 16 (64lb) USTA 4.5.