I am looking to get a racquet with a 18x20 string pattern and have read good things about the Aerogel 4D 300 Tour and the Biomimetic 300 Tour. These 2 are close in specs so I was wondering which racquet you would recommend? I mainly was wondering which one was easier on your arm and shoulder. I've been getting pain in my arm from using my RDiS 200 (even after using a soft poly in a hybrid). Thanks.