OK, so for what it's worth, I've come to a conclusion as to what is the "correct" gamma for my setup. Here's my setup.
1. Plasma TV.
2. Light controlled room with lights dimmed, but not completely off.
3. Using ColorHCFR with a DisplayLT.
I've managed to get as flat a greyscale as I'm going to get (all but one point with deltaE less than 2 and the outlier is still <3)
I used the "Camera Gamma" setting with a target of 2.2 as my target and manage to get a near perfect fit on the curve.
So what does the picture look like you ask?
I've tested with a sampling of DVDs that comprise both dark scenes and bright scenes and am quite pleased with the results. This is a purely subjective evaluation. There is not banding that I have noticed, shadow detail is quite good while still maintaining decent blacks and detail in the bright sections is also good.
FWIW, the DVDs I used were: Underworld, Matrix Revolutions, and The Fifth Element.
I think I am done for a while.