| Jeroen
I just had to kick in an opinion here.
If you haven't tried the Monette mouthpieces in the C-1 to C-4 range, I think you owe it to yourself. This would include the C1-5, C1-5M, C1-2, C-2, C-3, and C-4. (The C1-1 is huge!)
You might need to have your repairman adjust the receiver on your C trumpet to get the right gap, but you did say that you wanted to find the best mouthpiece-horn combination.
Short of buying one of those wonderful Monette horns, this solution has worked for me, with a C1-5M mouthpiece and a Callet C trumpet.
There's my 2 cents worth.
Ray |