i love heavy frames (around 13 oz) and am smaller sized (5'6" and 140lbs dripping wet). some of the put-away issue is the frame and some of it technique. you're probably actually swinging too hard with the heavy frame, and possibly giving too much topspin. i've done both, but have learned to relax the swing and let the frame mass do its thing. you'll get a faster swing, too. also, sometimes you have to flatten the put-away ball, especially if you play fast extremely mobile opponents.