Awesome progress! The bottom of my bottom lip is nearly healed from what I can see, posting a picture tonight on my site and video...I'm getting really excited! Ever since I started getting them wet in the shower things have been improving faster. So I think getting them wet is a faster way to do it so that is what I am going to recommend from now on.
However I don't recommend using any products to keep them from cracking, your body has healed this far why would you think it would be incapable of healing completely? I'd suggest every night or morning a warm shower getting them wet, and just avoid smiling as much as you can until your body heals them completely :)
You're doing awesome! Can't wait to be able to put you on the list of cured individuals!