That's great that you got back out. #3 is my favorite, I do like #1 also, but I think cropping it to a pano crop would really strengthen it. Lose about half of the bottom.
Thanks for the kind comments. I've been using the 100-400 more and more for extracted landscapes. Really enjoy the compressed look. If you look closely in the lower left third of # 4 you can see a water tower standing on one of the ridges. i almost removed it but I thought it really added a sense of scale.