I also decided to go with Flourite Dark and I love it. I washed and dried it as well before capping my MTS and there was no clouding at all, I was relieved. I wanted a darker substrate, but not completely black, so this was a nice middle ground. Sort of reminds me of mulched up leaves.
The texture isn't quite what I had expected and as you mentioned, it can be fun to get stems to stay down, but all in all I love it.
Nice write up!