This is cool, I think you’re definitely onto something, but I couldn’t really wrap my head around curve control in a quick look.
I can’t say for sure as someone who never mastered it, but would guess it’s something to do with the bead adding (vertical-only?) spin that’s semi-independent from your current mouse movement? My instinct was that only the flick right before release would matter. Trying to flick curved shots while holding RMB got slightly more intuitive results, but then I was being killed more often by my own ricocheting shots, which are awfully punishing, to be killing you in one hit.