Weird mouse stuttering problems in OS X El Capitan?

So a few days ago I decided to upgrade my Mac to El Capitan. Afterwards, my mouse started behaving weirdly in CS:GO, TF2, any Source game. Specifically, the mouse will not register slow movements and when trying to aim precisely at long distances it just doesn't move. I use a SteelSeries Rival 300, but I really don't think it's a mouse driver problem.

An important thing is that when I re-enable mouse acceleration, the problems disappear, but, of course, I can't play with mouse acceleration. I know I'm in the minority of people on this sub, but if anyone could help it'd be greatly appreciated. Even if you don't know the answer but have experienced the same problem, let me know. It'd be nice to see if this is a common problem.