So I bought a Strad. It's used, and it's a great horn. It plays very open and is the most responsive horn I have ever played. I can play from low F natural (3rd valve slide adjustment to allow for fuller extension of the slide), not including pedal notes, to the first A above the staff with no effort hardly at all. It is very easy and fun to play, but it tightens, for lack of better words, when it gets above that. I can play the notes, it just feels like there is something holding me back. I don't really know how to explain it. Anyone else experience this?