Hi, I'm a lead player in a few big band ensembles. A high G is no problem for me, I can hit it pretty consistantly. But now I want to extend myself beyond that and really show off, like a normal lead player is supposed to, right? Anyway, in terms of playability, high A's and B's are next to impossible to get out, while double C's are a lot easier. I can go high C, D, E, F, G and then hit a wall at A, yet I can slot up to a C. Is this due to the physics of the trumpet? If so, should I think about investing in a pro model horn? As of now, I'm playing a Yamaha Intermediate model, more specifically a YTR-2335. Thanks!