I dunno man, turn the g5 down to 400 dpi, and a pretty low in game sens, and then load up source, and try and move your arm as fast as possible over a large distance I’m betting you will get tracking problems, the g5 is pretty notorious for it. At mid to high sensitivities the g5 is fine, but it ain’t good for low sensitivity. I attached a demo below, check it out I’m guessing those are the problems you are having.
