Thanks, Chris. The C10 is brand new (I bought it from TW, of course!), so I am assuming there are no cracks. I did realize that I was using a Babalot Custom Dampner without the inner gel piece, so perhaps I can cut some of the vibration there. I also picked up the Babalot RVS dampner too, just in case that could help more. But, in the end, it may have been just me learning the new racket. It is heavier than my old racket and stiffer, and perhaps I just was trying to do too much with it too fast. I have it strung at 54 lbs now...maybe I will take your advice and drop it to 52 or 50. Thanks again for getting back to me so quickly...you are a great resource and your advice is much appreciated!!!