It's harder to get a discount at Vero Beach than it is at WDW. I think you are fortunate to have secured a DC discount. We were unable to do so (even thugh we booked almost a year in advance and checked back often) for late November/early December (in 2001) and mid-February (2002).
I have not ever seen any AP discounts for VB.
Sometimes there are special deals sponsored by the
DVC sales department. If there are any that apply to you and the time you are planning to visit, you can find out about them here:
DVC Special Offers
Click on the link for Magical Vacation Offers.
In previous years, there has also been an offer for VB (and HHI) in Birnbaum's Official Guide to WDW. I don't know if there is one for 2003. IIRC, it was for up to 25% off rack rate. There are certain blackout periods for that, though.
As you probably know, VB is a DVC resort. If you are comfortable doing so, you might rent a reservation from a DVC member. If you want to do that, check out the DVC Rent/Trade Forum. Here's the link to that:
Rent/Trade Forum
HTH. Good luck!