Trolling mouse/ attack direction question

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Aside from switching to use of movement keys for slashing, you could try re-positioning your mouse so that it is completely perpendicular with your body (meaning that when you move your mouse forward and away from your body, it is for an overhead swing, and when you move it toward your body it is for a stab). When using your mouse, you might actually be moving it while it is in a slanted position in relation to your body. And if you can confirm that that isn't your problem, then it'd be a good idea to see whether a different mouse makes a difference.