I used to play all kinds of patterns like stamina(hs,js), chordjack, speed and so on, and now I can play stamina map at 220 to 250 bpm(depending on the specific pattern) and chordjack at 130 to 145 bpm(96% in beta jackmap), but I can hardly get 96% in the speed map of the 9th dan(I have clear reform 10th dan 7 months ago). I used to believe that practice will be a good choice, but even I play a lot speed maps I can't see any progress, while I achieve obvious progress when I practice stamina or chordjack for days or weeks. I find it hard to read speed maps and I feel my fingers can't move that fast. So what actually makes speed maps so difficult and how to get improved effectively?