I have been playing my three Bb trumpets on a rotating basis. This week I am playing my Strad, with a Bach 3C mouthpiece. I set aside the Curry 3C. I had been using due to some frustrations that the Bach 3C appears to have relieved. As noted in the OP, my Strad showed little sign of serious playing time before I became its owner. Really, I have been breaking it in and modifying it to suit my tastes. I replaced the dump slide in the third valve slide assembly with another (from Bach) with a water key. I also replaced the second valve slide with a Bach replacement. The third valve slide assembly was stiff to the point where it was not useful for tuning purposes. I remedied this condition with regular lubrication and cycling. It works well now. Playing the Strad this week has been satisfying. I strike notes accurately and cleanly. The sound produced is great. The valves function flawlessly. Perhaps one day I’ll get to use it in Community Band once again. Until then, it has become a most enjoyable instrument for daily practice.
Jim