The balance and musicality in this Waltz is really quite difficult. I don't seriously believe you can get it to an acceptable standard for your talent show in a month. For that, either the Invenmtion or the Sonatina would be a better choice, probably the Sonatina.
That said, there is much to be gained from continuing to work on this piece to get the sound you are after. I see you are also doing a Prelude, which will help. You may also find that some of the Mazurkas will be good practice too. You need to concentrate on achieving the balance and flow you are after. It takes time; there are no shortcuts.
I adore Chopin, but there is nothing easy about him, even when the notes are pretty straightforward. He is also a fairly unforgiving composer - a substandard performance will really show itself. When played well, he is sublime; and to play him well is (on the occassions it happens) one of life's great joys. Keep at him; you will get there in time.