Ok guys, I need a new switch, my frames with Hollow Core Syn. Gut (As others say... Hollow Crap) is not working at all!! I lost 3 matches, in 3 weeks, and threw myself out of contention for playoffs with it. With the Syn. Gut, I got good power, but no control on my serves and hit long on a lot of my shots. I have: Lux Savage Green Lux Adrenaline Kirsh. Pro Line X Klip K-Boom Genesis Heptonic NRG2 NXT Donnay Multi. Which one of these? And what tension, recommendations please...??