Nice work! Personally I prefer the look without your extra curves adjustments, a little more subtle. I’m working on a new grade for my edit as well, inspired by your efforts here. I’ll try out your LUT too, thanks for sharing!
I agree that the original brightness is quite adequate in most places, and no global LUT is going to fix it. The extra contrast in the last screenshots was just to see how bad the brightest shots fared.
I don’t disagree with making the film brighter in dark scenes, but the last screenshots have a saturated green and orange look to it with a bit too much contrast for my taste. Personally I would rather brighten the mid-range or increase the exposure in the dark scenes instead of increasing the overall contrast. But you do what makes sense for your Technicolor look, our goals are a bit different.