Hey Stephen,
Of your edits, I do like the overall effect of the brighter ground layer. #1 might be a bit too bright compared to the background, but I do like being able to see more detail in the foreground trees, that's a big plus in my book. In the darker versions, the fall color is hidden to an extent because of how dark the ground was, with this now, the fall colors really start to shine. You can get cool colors in the sky any time, but fall colors only happen for a very short space of time, so my thinking is I want those fall colors to be on display.
#2 of your edits is my favorite of those, nice fall color detail, everything in the image is pretty evenly lit. Very well done.
I then I prefer #4 over #3 of the edit, I think will hills covered full of fall color, that not having an anchor of some other trees (as in 3) makes #4 stronger, and there is nothing but the pattern of fall color trees from the bottom anchor to the middle of the image.
Jim