Using a different height texture explains the different results. Odd, that the Arizona State University has more bumps than NASA at the same 64ppd resolution. Do you think they added noise to the NASA data? When I add noise to the height map in Blender, I can make it look like this.
I made this model a while ago with the same NASA data. I have no clue where you get the extra bumps in the flat regions from, because I also used the 1GB height map. But I think my bump strength is accurate, because it matches my references.
This is my recreation of your picture. Your bumps appear more detailed than mine. Did you add noise to it, or are your bumps just stronger than mine?
I did that as well but got what looks like pinching at the poles. Can I see your UV?