What was happening with me was that moving your mouse too fast rarely registered as a hit, which made you have to move your mouse much slower to actually break the object. Turning down my mouse sensitivity definitely helped with this, but I didn't realize that was a setting when I first wrote my comment!
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I was worried increasing the mouse sensitivity would help too much, in fact I used more dpis on my mouse only for testing.
Did the hit/debug lines made it to green? there's distance damage and velocity damage so I am wondering if you were hitting 0 as value or actually not even drawing the lines with that mouse speed.
Maybe a lot to ask for specifics but hey, thanks for playing our game