how much weight have you added in total?I've done both... added weight at 3, 9, and 7" above the butt cap (plus overgrip and rubber-band dampener), and used 18g strings (1.15mm-1.18mm) @ 46M/ 43C.
Plays fantastic. It still doesn't have the power of some of my other racquets, but I've had the feedback that the weight-of-shot is decent enough, and the precision is so good that it encourages a level of creativity very few racquets can match.
Fabulous stick, great feel, touch, and maneuverability. I get plenty of depth and spin, but can also flatten the ball when needed.