Thad,
I'm going to be out of town for a week and so won't be able to respond. However, it is most important how far away the listener is from the back wall because the sound travels past the listener, reflects off the back wall and recombines at the listening position. A simple answer in a small room is that the closer you are to the front, the further you are from the back and that is usually the best that you can do with the circumstances. That is with symetrical monitoring.
Hope this helps and your monitors even out.
Talk next week.
Bill