Sorry this reply is really late but if you still haven't done it, you kind of need to get right to the edge of the water and sort of go as little to the left as possible while jumping, and jump from just below the platform so you don't hit your head
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Hey! No worries about it being late, I appreciate getting a reply at all lol
My problem is that I understand how to theoretically do it, I just can't really execute it. More specifically, I can't get the height I need for the life of me, even when I don't hit my head on the wall.
I made a video of me doing a couple attempts to hopefully better communicate my problem: