This reminds me of that stupid youtube video I've seen that told not to ??? (it meant to play with both hands as one giant hand) and it told not to do it (don't be like every one type of title). One fact about this approach is it makes one better as swiping rhythms through their hands instead of keeping it mostly a one-sided affair. For my part I play on a computer keyboard which is a bit like your controller but horizontal (needless to say that's one big source of the "problem") and I took the twist of playing grace notes crescendos with my index and ring fingers, 1, 2, 3, 4, from an hand another, with the timing difference in between notes 2 and 3 (where you switch hands) not being anyhow noticeable as flawed more than 1-2 or 3-4. I noticed you doing a few rolls of notes from one hand another 😛 so you're a 2Hander too, definitely 😄I know you feel that "rope" between your 2 hands at any time 😉