You're a brave man, ronde. These variations are frightening and you have the technique and musicianship to pull them off. More performance experience ought to do the trick. I really admire this Alkan and your playing catches the piece's essence.
One thought: I noticed that you were seated rather high at the keyboard, much higher, it seems to me, than you are in other videos, particularly the Thalberg, if memory serves me well. I wonder if lower seating would help with some of the technical issues that trouble you with the piece. Higher seating, for me, gives a false sense of being "on top" of the music: in actuality, it creates tension in my arms and wrist. That seemed to be the cause of your minor difficulties in some of the fingery variations.
Worth checking it out. Your playing, in other videos, strikes me as very fluent and relaxed. In the Alkan, you appear less confident. Of course, it IS Alkan! Doesn't get harder, I know.
You'll own this piece. Give it time and thanks for posting the recording.