Talk to your rep....if he/she knows what they are talking about, they should look at your sites and make suggestions...
I know you've come a long way, since your early days, binxgook...but, you can't go wrong if you listen to Ramster and Sir Moby....
I know them....other great advice has been given, too....
Is it just your conversions? And, is this a pay per sign up program? Or revshare...
I've learned, with my own sites, that sometimes it isn't ALWAYS me...maybe their tour needs to be refreshed....or they made changes to the tour that aren't working as well....with their traffic...