That makes sense. A brake that never settles on the requested pressure would drive any driver crazy, and the coughing release on long trains is such a specific thing to notice and fix. Respect for taking on the mechanical side too, even if it's turning out harder. Sims like this live on that kind of detail.
Out of curiosity, where have train sim fans been finding the game so far, mostly itch, or also places like YouTube and Reddit?