It's actually much better to just find the native DPI of your mouse and use that (for example, most 3500/4000dpi mice work best at 800dpi). Mouse sensors aren't perfect, so they're more prone to error when you increase their DPI.B1rd wrote:
I think it's probably best for precision to turn your DPI up high and then just change your Osu! sensitivity. For example, say you like 400 dpi, turn it up to 3200 and change your Osu! sensitivity to 12.5.
Also, software-based interpolation will limit the amount of information interpreted from the mouse, so it's not necessarily the best solution. Using your example: if you're using software to divide the DPI by 8, you're also effectively dividing your polling rate by 8.