I just need to know how accurate they will be and how I can maximize their accuracy.
Rotational speeds (unloaded and at probably at the higher end of the applied voltage range) for standard servos are usually listed for for the servo. In some simple test I found a standard servo could position at ~425 positions in ~190 deg of rotation. Servos have some built in dead band (~5us) to reduce position hunting. Best to get a servo and start experimenting.