A friend gave me his LM Rad OS to string. It was originally strung with Isospeed Baseline 16, strung about a year and a half back. He finally broke a cross on a shank. The string bed's pretty tight, so I'd guess we're talking about 60 pounds full poly. The friend says that he doesn't know strings or rackets, and can't tell the difference between two strings. My string inventory's low as heck right now, so I'm thinking that a kevlar hybrid would be a good choice for him since he doesn't restring. He's a very hard hitter too... What tension would you recomend for the kevlar/syn gut hybrid in this LM Rad OS?