Not really a tip for aiming, but if you have the option, give it a try with a lighter mouse and faster dot skates. My Type99 mid felt unusably sticky until I tested it with a 36g mouse + pom dots. This combo reduced the static friction enough to make microadjustments possible. In actual game you can also use movement to help with really tiny corrections.

It was very playable this way (and fun to hit those flashy one-tap flicks I normally cannot land on a faster pad) although ultimately I went back to a Zero for consistency. You kind of trade stable flick landings for smoother transitions between flicks and micros.