Matt,
I can't thank you enough for you personal assistance with this. You really helped me understand the importance of accuracy with the perspective lines. I also did not realize the importance of making sure that the reference object was in line with the perspective lines.
For the forum - if anyone is listening - The problem was that I had the reference object way far away from the perspective lines, and not really on a point that the perspective lines were converging on. I also had my vertical perspective lines what I thought was just a couple pixels off. A couple pixels is a big deal. It really needs to be super accurate and you need to be sure that the vertical element in the photo that you're using is actually vertical. If you're using something like a pillar you're probably fine, but if you're using something like a home-made accent piece somebody installed, you're trusting your accuracy to that guy's spirit level. Thanks again Matt for your above-and-beyond level of support.