Working with an MG Radical MP (with 4" of lead at 10 & 2) I removed one overgrip (8 grams) and 5 grams of lead from the handle and replaced with 13 grams of silicone. So, weightwise it's exactly the same, although the silicone is all at the bottom of the grip instead of spread out. Total weight 339g. First of all, WOW. I feel like I'm hitting the ball with a 13oz racket. Soooo solid like a sledgehammer. Feels great on groundies (I can step in and hit flatter with so much control!), volleys, touch shots, and helps tremendously on overheads. Contact feels so solid. The only issue is that it actually feels quite a bit heavier and feels sluggish on my serve - I can't get the racket speed I'm used to. (I didn't mind the weight on any other stroke). I found myself just placing the serve but not able to get enough speed to rip one at all. It seems strange that it would feel/swing heavier with the same static weight (I used a scale) and with the weight being shift toward the bottom?! Is this a phenomenon of the silicone feel or of the polarization of the weight? My other MG Rad MP (without the silcone) actually is 2g heavier for some reason, the balance point is the same, and feels much lighter. Anyone?