No changes to the engine since that dyno run. Well, my rear resonator fell off of the car half-way through the evening.

(But the 14.002 was before that happened). Slip-joint just separated, and was easily fixed when I got home.
When I was at VIR, the car weighed around 2600 pounds with a full tank. At the strip, I had about 1/4 tank. I add about 175, depending on the meal I ate prior.
Your car should have a lot more than a 15.2 in it. The wagon weight doesn't help, but it shouldn't be all because of that. Has the engine been tested recently?