If I remember correctly, @Kilgore
is using a video processor, which gives him much more flexibility to make Cinema mode behave. I'm trying to take the video processor out of my video chain so I can move it to another room.
I was able to get gamma to track pretty well with the predefined curves as well (-1, I believe, but maybe -2). However, I found I could get a much more pleasing picture if I followed @Ellebob
's advice that I posted a few posts back. If you want to get adventurous, give it a try, you might find some extra shadow detail you didn't know you had.
Use contrast to get to the light output you want. I found that 9 worked well for me, as it preserved some headroom above 100% white, and gave me nearly 14ftL. Your room, setup, and screen will impact that, obviously. Keep in mind, when you adjust contrast, you affect overall gamma, since it's relative to light output at 100% (and 0%).