Greetings. I've recently noticed that whenever I'm playing a longer piece, like our marching band show, for example, a lot of moisture builds up on the rim and makes it very difficult to play. (As as side note, I play with a "dry" embousure [too lazy to spell that right] so it doesn't take much moisture to throw me off my game. There is simply too much movement caused by the extra lubrication.) I personally think the cup diameter might be too big, the bigger the diameter the more room for moisture build-up right? Any tips would be appreciated. Thanks.