I strayed from my Selkirk Mach 6 (Amped v2), to a Ronbus R3.16 and the Vatic Pro V7 16mm, and my arm is KILLING me. It’s like going back in time when I dropped my string tension, changed to a multi in Technifibre X-1 Biphase for my the Babolat Aero Pro Drive tennis racquet. Im going back to the...