I had to spend some time investigating, but I finally found a riser pad that I thought would do the trick. I bought Roma's Wither Relief Lift Front Half Pad from Dover Saddlery. When I took it out of the box, I was a little skeptical as it is super light weight. Even Hubby cast it a disparaging look. Not one to judge a book by it's cover, I decided to give it a try.
As soon as I got on, I could feel the difference; the saddle was definitely higher in the front which felt MUCH better. When I next ride, I need to place the half pad a bit farther back on the dressage pad.
Overall? This was a good purchase. The pad sells for $29.95 ($28.45 for USEF Members) at Smartpak and for $34.99 at Dover Saddlery. I had a $20 Visa Reward from Dover so with my discounted shipping, I ended up paying only $19.94. Not a bad deal!