And even though I have that claim to fame, I'd run the upper maybe 5-10 times total, versus hundreds for the regular stretch. So I don't have any words of wisdom to help you, just some random pictures.
The way upper section has a few ledges, but if I remember right most of it's just nice clean waves at normal water levels.
The olympic course itself is pretty heavily developed, with two bridges over the river, walkways down either side, in many cases the walkways are below the river level.
This is a part of the Virtual Ocoee pages of Dan's Whitewater collection in the home pages of Dan Lyke , reachable at email@example.com