I'm slowly getting used to my new sens, 400dpi @ 2.83 ingame sens, that's 120cm of mouse movement for a full 360. It's only to further delete my old musclememory of wristaiming though and I'll soon go to 800dpi @ 4sens, which is a reasonable 40cm sens. I used to play with 30cm sens, which was quite solid already, but my old wristaiming musclememory kept me from truly ever using my arm, hence I had to do something about it. (Overwatch)
In relation to Osu, I'm thinking to go from full resolution, full area, to full resolution and small / medium area, but I'm not sure.