My Victor Thruster K9000 strung with BG66 Ultimax gives me great control, but the power for me is just not there. Smashes are weak, probably due to weak wrist or improper technique. However, I must say that it was restrung months ago at 25 lbs. and now has about 40 hours on it, so tension and liveliness surely have decreased. I'm just wondering if I should restring the 9000 at less tension (22-23 lbs., or since it's already about at that maybe less, 21?) for more power, and to get a livelier feel from fresh strings, or give the Victor K6000 a try since the shaft is supposed to have a little more flex, thinking it would give me a little more power, plus the extra flex would help dampen vibrations and be easier on the shoulder. Would a switch to Aerosonic string help? What differences would I notice? Thank You!