Having had a little joke at your expense, I agree that the problem probably isn't so much to do with your shoes as with nervous tension in your legs/feet/ankles/brain.
Just change to lighter shoes*, try to relax and it will all come to you.
P. S. If it helps you to know, I still have to work hard at the balance in some types of heli and I've been doing it since 1978..........
*Not ballet shoes, mind - that's possibly going a bit too far.
