Hey Brian, these are great! You got some terrific bolts here. Did you see I had gotten some lightning a few weeks ago up in Greeley. Since I rarely see lightning it was an awesome experience for the 10 minutes it lasted.
One of my shots is in Let’s Play which ends today.
As for the ground, I will have to politely give the opposite opinion from Alan. Lightning in almost all cases is about the lightning, so letting the ground layer go dark is fine. It’s not like a typical landscape image where the foreground often plays an important part of the photo. Plus, as both of these are composed you have only a small bit of ground in each shot, enough to anchor the shot but not enough to give any interest if they were brightened to give more detail. And, it looks like it was dark out anyway, so to brighten the ground or lift the shadows could make the small strip of ground look unnatural in these photos.
But with that said,

if these were mine, when I did convert them in raw, I would process one version like you posted here, and I would process a version with the ground brighter just to double check that my feeling for a darker ground was correct.