For anyone else suffering: here's another way to solve this part :
Viewing post in Avoid The Storm jam comments
It really helped, and I had trouble doing it even after you showed it, but I was able to do it exactly like that, including after dying at that checkpoint. It's harder to do it after dying at that checkpoint than if you died in an earlier checkpoint, because I noticed you can possibly get away with doing something less clean and less skilled since there's more time (at the possible sacrifice of a few seconds of time though), but if you die at that checkpoint, you have to actually do it this exact way or you'll die.