i'm currently using BG 65 at around 21 lb tension (probably went down to 20 already) anyways, i need some opinions on string that i should use the next time i get this racket restrung. My situation is that i play with nylon birdies, although i do have some feather birdie, i don't play with those that often. In school, we also use nylon and i heard that BG70 Pro is for playing with nylon also...but on the other hand some people also say that the string is a lot stiffer than BG 65. What about the power wise? Which one will produce more power, last longer, and keep tension? Thanks, Please give me some feedback on both the strings and what you recommend.