It’s a real problem for me. Stimulants at higher doses allow me to lose hours on even less useful things. Some, I find better than none, but like a switch if I go a little too high it can end up very negatively. I associate a bit too well with what I know of neurotypical response from stims on the wrong side of that curve, despite clear “high functioning” ADHD, and the definite benefit when luck keeps me on the desirable side.
Often, extreme fatigue would replace hyperfocus. This happened increasingly more after being started on Agomelatine, a 5-HT2C antagonist, which I’ve since learned leads to increased dopa effects from stims. I don’t know if you experience similar.