Over the past couple of weeks, I've tried to adjust my mouthpiece placement by moving it down. In the past, the rim of the mouthpiece is almost touching my nose. I could play fairly high, but when I got into the extreme upper register, the pitches were terribly inconsistent in their sound quality. I also couldn't play in the lower register without shifting the rim. I lost an octave, but it's getting better. What do you think about this decision?