Mouse issues in Overwatch

Hello, since around Christmas or so I have had issues with tracking in overwatch. while it usually feels okay in spawn room, whenever I am in fights/shooting at enemies it feels like my mouse sensitivity drops drastically whenever I aim away from the centre of my screen (e.g. tracking targets who are on a long strafe). Occasionally, my crosshair will not move at all despite me moving my mouse, it also feels like I have a considerable amount of input lag at times. I’ve tried a bunch of different solutions to fix this but have had no luck. These include: trying three different mice, reinstalling windows and reinstalling drivers as well as many other things. I have no idea what is wrong so any help would be greatly appreciated.