I have a few questions to ask regarding my euphonium mouthpiece. Currently I use a Bach 6.5AL ... about 18 months ago I got it because it was a good size and I could get one with a smaller shank for my trombone. However, recently I have been looking around with a view to buying a new mouthpiece because the Bach feels a little too small. I was thinking along the lines of a Bach 5 or 5G ... this wouldn't be too much bigger and I'd be able to keep using the Bach series (I quite like the dark tone I can produce with them). However, when I got my sovereign euphonium last August, it came with a Wick 4.5AL ... which at the time I just dismissed because I had no desire to change mouthpiece. However, I had a go on it recently and found it was fairly easy to use. The sound isn't the same - not worse, just brighter. The thing is, the cup diameter is 5mm greater than my Bach and it is a lot deeper. Would this be a jump to far? Or, should I consider getting something like an SM4 which I gather is of a similar size to the DW 4.5AL? Ideally I want to get a mouthpiece I can also buy the smaller shank equivalent of for my trombone. Obviously using the Wick would be useful because it would save a hellova lot because I won't have to buy 2 new mouthpieces, just one. Any tips would be useful thanks.