I'm a 4.0 player, play with the K90. I have been trying out various strings to come up with something that works ok for my playing style, and here is what I've tried: 1. Yonex Poly Tour Pro 16L @52: Very plush and easy on the arm, but lost tension in about 4 hours. 2. Head Velocity 16 @ 58, Head Velocity 17 @ 60: Very easy on the arm, but both combos were too powerful for me. 3. Babolat Synthetic gut @ 60: Not as plush as the ones above and still a little too powerful. Not durable though, broke in 3 hours. 4. Head PPS @ 60: Broke in 3 hours. 5. Wilson synthetic gut, Wilson Sensation: All too powerful for me. I'm about to try Solinco Hyper G, 17 gauge. Any suggestions on a tension that would still be somewhat comfortable on the arm?