I am currently testing on some strings with different tensions. I'm not sure weather you will have the same exprience with me. BG 65 and 66 : if i string it at 23 and 24lbs. i feel that i lose some power in my smashes and drives. Have anyone tried string them at 27 to 29lbs? BG 65ti and 66Ti : I strung it at 27 - 28lbs. But it losses its tension within few weeks. maybe goes down to 24lbs. Is this a common problem? I hope some of you can share your views and experience in using strings with different tension. you might also want to state the racquet that your using with. M using MP90JP at the moment.