Good laser mouse is not worse than optical for normal gamers. But actual optical systems can't be wrong for gaming in any case.
For mouse settings, search the web for different good starting points, something phrases like "CS:GO mouse settings" (I assume you play Global Offensive). Also make sure to set option ingame for ignoring Windows settings. Then it should only use mouse driver and ingame setting only. Set it to your liking, but if you like slow movements, then use high dpi anyway and slowdown with ingame setting. The high dpi will ensure accuracy. For getting slower mouse movements, you could also decrease dpi, but then it will get less accurate. So its better to use ingames speed setting. Mine is ingame at "1" or "1.07" and mouse at dpi 2800, but slowest speed setting in mouse driver settings (Roccat Kone XTD Laser).
Edit: Oh while I was typing, you already said it wouldn't help you.