The symbol and coloration are getting there. I like #12 without the tag line more. I'd like to see these designs with a few different colors to see if something fits better than orange. Maybe blue and black, and a couple other combinations? I think you're on to something with the symbol. I really like HabitList.com's infinity symbol. Obviously I don't want to look exactly the same, but something that conveys continual growth is what we're going for. Also, I do like the clean feel of habit list's branding so it's a good example to go off of. I hope this helps!
Thanks so much for your submissions. They're a great start!