My vote is for drafting 17 to 20 each. I'll bow to you, the commish, and the other managers on that (I'm easy).
Also, I'd like to thank you for putting this together. Probably takes a lot more work than you thought when you did it, but you're doing a great job. I've done three theme leagues and they are not easy. A progressive theme, with a draft, has go to be the hardest. Again, thank you for all your work on this.