ShiroKuro That's a beautiful piece, I can see why you chose it. The piece is way beyond my playing level and I would never have the courage to perform in a live recital, but since you asked for opinions here are my thoughts about tempo issues. You play the piece in a steady way, but I think the issue is that you are not differentiating enough between the lengths of short and long notes - you are playing them too "similarly" to capture the nuances in the tempo. If you listen to the professional recording and immerse yourself into that process, you can imagine waves rolling gently up onto a sandy shore, they approach slowly and build up, then there is the cascade of water as they break. That is the sort of feeling I have when listening to this piece - I find myself mentally anticipating the next musical "wave". Maybe if you try this you might get a better idea of which sections to speed up slightly and be more conscious of the rests.
It sounds like a good idea to play an easier piece before this one, as it might help to relax you before playing this piece. You are clearly a talented and confident player and with time I'm sure you can finesse this piece, but if you feel you need more time then perhaps just play the other two easier pieces at the upcoming recital, to take the pressure off.
"Don't let's ask for the moon, we have the stars." (Final line from Now,Voyager, 1942)