Manny- I have evolved a bit in my playing style (especially on my Bb, a Lawler). I can really relax quite a bit on it and still maintain a good amount of energy in the sound. I am really liking that. But when I switch to my C (a Yamaha) (same mouthpiece...Bach 1c) I find that I drop partials playing the same relaxed manner as my Bb (especially around D, E and F on top of the staff). It feels like I can't relax on those pitches at all, and as a result they sound (to me) a bit pinchy...not the open warm quality that I want. As a result, I sound a tad sharp there. Any suggestions?