I love a stiff racquet and other then one tennis elbow bout after 35 years of never having a problem but I bought a Wilson 6.1 95 strung high I have never had any arm problems so arm problem is not the problem. I also use about 20 grams of lead tape and my racquets weight around 13-13.5 oz. I am a agressive USTA 3.5 61 young years. I am now trying new stiff racquets RA 67-71 strung at the bottom of tension. If I like the bottom range can I enhance the stiff feel by going some kind of poly for better bite and a harder feel? If so, which poly or poly setup would you recommend?