Alright msycamore, just for you I scrapped the homestead shot and had another go at it. You're probably right that there's no red in the sky (why would there be indeed!) So I tried to get as much out of it as possible. I also realized that the negative1 workprint had more detail in the shadows than the blu-ray, so now in this version you can see more billowing smoke. The grain doesn't match, but you can't have everything you wish for.

http://screenshotcomparison.com/comparison/58220

Thanks also for the information guys, I'm still very much on a steep learning curve with this.