Hi, I had the opportunity to play with a "Bach 1 1/4 GM" Bass Trombone Mouthpiece for a while and think it's a good MP. I would say it allows for very well tuned playing and also let me play very even. I also compared it with a Laskey 85MD, which needed more effort to let me play with the same core and stableness in mid or upper registers. The Laskey had a big advantage in louder dynamics and especially in lower registers, as it really opened up at a certain point and the sound was bigger compared to Bach. Is there a Mouthpiece that is as well tuned as the 1 1/4 GM and opens up like the Laskey?