eCommn,
Welcome to WPW and thanks for sharing your program with us.
For being new to our world you sure did a couple things right! Long cookies, high commission and 800 tracking should earn you some loyal affiliates.
The only question mark I have is your tracking. Are you saying you are using OS Commerce for affiliate tracking? I don't know how good that solution is, only know that affiliates tend to trust the tried and true affiliate tracking programs best.
If I were you I would check out
www.ShareaSale.com I think your program would be very popular there.
Maybe Cedric or one of our other affiliates would comment on OS. If it's not broken, don't fix it, but I just never hear of any GREAT programs using it and it sounds like you are putting lots of effort into making this program GREAT!
Best of luck!