Hi Allen,
I've spent some time working on the Zam and try to go back every year. I wrote a long article for kayakers on my old blog; check this out:
http://linesandblunts.blogspot.com/2006/11/kayakers-guide-to-zambezi-and.html
Unfortunately Adrian is right, Sven has sold and moved on but Nico will be more than happy to help you out.
Personally, and if i were you i would think about going at the end of November or beginning of December when the water goes from low to medium - there is more play potential and the more modern, shorter boats make it more fun. Also the river is more scary than it is dangerous, its more fluffy than anything else and most things flush. However, like any river there are dangers to it and there are lines on which you can really scare yourself.
For the average boater, though, the regular lines are big and easy to stick.
You're welcome to PM me if you have other queries.
Good lines,
Scotty R