I haven't played this waltz but other piece with big leaps recently. What helped me was practicing the part with leaps slowly, hands separate and hands together - always much slower than I could play the rest of the piece. Doing this constantly, every day, helped. Even when I was not practicing this piece in given practice session I would just spend some time practicing only the parts with leaps. Always practicing slowly, not trying to play it at tempo. I find everything must be "in preparation" when I am playing so one has to be ready for the next difficulty, like the leap. That said, I looked for moments when I could quickly glimpse at keyboard where given hand was going to play leaps just shortly before playing the leaps.