I put much pressure above A 2nd space :(
Now I use mouthpiece PAXMAN H20AX, but I think that it is not what I need... Does anybody know where I can see a catalouge of all PAXMAN mouthpieces?
Try www.horncups.com where all the technical data is. Or paxman.co.uk for the basic mouthpieces.
But if you're using pressure that low down, perhaps you need to look at your technique - or better still, get a teacher to look at it with you. Just changing mouthpieces doesn't solve the problem every time