keyboard actually also works surprisingly okay in this game too (seen multiple speedrunners use it even) tried it a couple of places myself too, tho i overall totally prefer the sticks too (dpad is 100% useless on my x360 lol)
if you don’t go for magic bounce, you can always just stick to regular nail bounce, the overall point being this fight should never really have to put you in situations where you should get in such “buggy stick” motion -by being sorta always “moving” one way or another to avoid & attack
(unless it does that weird stick direction switch no matter the long motion you use, and not just on short turns/“stick flicks” ? -which would suck)
tiny fight spoiler?
if you try to notice, you should see a “starter” opening on all watchers, as they spawn in. Depending on your setup/approach this can actually be a rather huge window for you to use. And then take advantage of their individual movements, as they are rather slow to react/move -when not ball tumbling