stretch that arm all the time. stop sign up with hand for 10 sec then down for 10 sec. 10x. search for te stretches on google. do this any free time you have. ice after play like you state. forgiving racquet as per tmc. if none of that works ditch the poly. done.
all the above assumes you are playing with poly for a reason.
Seriously, I am attracted to women of all races (except eskimos... - forehandofdoom