Hi bwack,
Glad to help.
Yes, you have many ceiling corners begging for bass traps. :-)
I'm not sure I'm understanding what you are saying about the drywall. Do you mean that parts of the walls are unfinished, and that the room is not sealed up with drywall?
Pulling your desk out from the front wall would be good. Find the 38% point back from the front wall, move your chair to that spot, and then move the desk forward until the speakers are an equilateral triangle. Most likely that will sound much better. You'll also need to tweak your room treatment placement for your RFZ.
Do you do tracking in that room? If so, I'd most likely stay in the section where you are, that way bands/performers can come in and set up behind you in a slightly larger space. Plus it's more convenient to the door.