I demoed the KFactor 90 and found that balls are flying deep and serve control is also not as sound as my PS 6.1 95. I have a long, fast and flat forehand and also a big flat first serve. I was at 60lbs with Wilson NXT Tour 16 on my PS, but noticed the demos are usually strung at mid tension plus 2 (57). I like the power and overall feel of the 90, but if my balls are all going out, what's the use! Is the swing weight and power of the 90 plus the lower tension the culprit? I like to take a big cut at the ball and would hate to slow it down just to keep the ball in! Thanks in advance for any suggestions yall might have.