I'm a yonex string user. I strung my AT900P BG66UM @ 27lbs, but ZFii with BG80 @ 24lbs. The reason as BG80 very hard feeling. Which i need more afford to hit harder for back court clear. BG80 @ 24lbs still hold tension very well like BG66UM @ 27lbs. I've give Zymax 65 a try recently. Need to string on my AT700 1st gen. Which tension i should go for it ? Any Zymax string user pls advise me. Thanks.