Dear trumpeters, I have searched on the subject and useful information is either very sparse, or too generic to be of use. I have a very low mouthpiece positioning, I currently use a Bach 1 1/4 C (which is 40+ years old!) and the the cup sits predominantly on the lower lip, so much so that the top of the mouthpiece sits just below my upper lip line. In addition to that to play trumpet I have got into the habit of pulling my jaw and lower lip back which results in a lot of overbite and I end up pointing the trumpet a lot further down than any other trumpeters I have seen. The overall result is the pressure is focused on my top lip itself and causes it to deform over the course of a practice, limiting endurance. I am wondering if this could be a contributing factor to my stamina and range issues? I generally practice 20-30 minutes a day but can only comfortably get an A above the stave and just about reach a high C. I have been trying to push my chin forward which can take some of the pressure off my top lip which seems to help, but any attempts to move the mouthpiece to a more normal position are really difficult. I will try and seek tuition but I had a few lessons over Easter which weren't that helpful: "pinch at the edges and blow harder", so I expect I will need to see a teacher more specialised. Can anyone give advice on whether I should persist with altering my mouthpiece position?