Love these shots! It was the most amazing piece of engineering mankind has ever put forward in my opinion. There is a fairly new company in Ca. That is heavily into space exploration called Spacex but you no doubt already knew that. They intend to launch this year(and last year and the year before that) a rocket that exeeds the lift off thrust of the shuttle. Your photos brought back a ton of feelings and memories.
I've had mine for three years and couldn't be happier with it. I only use it with my sigma 150-500mm and 135-400mm. When I got it I did see a bunch of ebay resellers that had it at inflated prices. Google is not nearly as accurate/honest as one might think.
The first one might be a little heavy handed but sometimes that's the point. I think it absolutely rocks! Your composition and exposure are excellent. I would print the first on metal and hang it on the wall!
Pretty impressive job and shot, particularly on the foreground detail. I don't see any evidence of parallax. The composition is nice as well. I don't do a lot of panos but I use PSE 13 for the ones I have.