Hey Nyal I was going back through your article and noticed that you set the Intel graphics to output 1080p 60. Did you intentionally not use its ~24hz setting due to the current issues around the chipset not outputting the exact 23.xxx that is needed for that setting, or did you just not feel it was needed?
I used to use HTPC for Blu Ray playback with TMT3, 5, etc, but got fed up with wanting my source to output the exact 23.xxx hz signal needed and went back to my Oppo playing ISO files. I love the jukebox and other features the HTPC has but couldn't convince myself to give up the exacting nature of a quality standalone.
So my two issues were the 24hz playback and also trying to figure out how to get the PC to "leave the video signal alone" as best as I could. Obviously the PC has to output some level of gamma, brightness, etc that is set in the driver. How did you decide where to leave those? Just leave them at default and calibrate at the projector (or Lumagen, etc, if used), hoping that the native settings done crush blacks, clip whites, etc? I know early on in the HTPC days one would have to fiddle with the native settings of the graphics card app to get BTB or WTW to pass, regardless of the "pc level / video level" settings. I think that has been largely fixed these days.