I've used a Wick 6B on Trombone for some time and like it very much, the higher notes above the stave can be a bit of a push sometimes but I can get some lovely peddle notes and a nice full tone. Some time back a more expert player than me (he's a second section player) suggested that the Wick might be on the big side for a 1st Trombone and advised that he played something slightly smaller, but I think it had a deepish cup still. IMHO a change of mouthpiece isn't a silver bullet to cure all things but a good one sure does help. Simply put you have to put the work in to get a decent sound but the right mouthpiece eases the work load. As a low brass player I've used ease of getting the peddle notes as a proxy marker for the quality / richness of sound that comes with 'the best' Mouthpieces, is that an error? What I haven't considered is the value of easy playing in the higher register and maybe I should. How often does a first chair part go to top C and how often does it go to peddle C? Who has ever had a part that asks for peddle C? Looking at old Mouthpieces, as played by Bandsmen decades ago, I see that many of them are smaller cupped than we commonly use today. Were they correct, in an overkill search for richness of tone do we have a tendency to play on Mouthpieces that are oversized against our actual needs?