I am looking for a new player's racquet. I have been using the O3 Red but it is too stiff for me. Been experiencing elbow pain. Have recently tried the Head Flexpoint Heat, Dunlop M-Fil 200 Plus and Yonex RDS-300. Any recommendations? I am 53 years old, play an honest 4.5 level and still like to crank up serves and returns. Don't mind less powerful racquets as I can still provide my own power.