Hi and welcome!
No feedback here, except to say that it sounds like you are doing what you're supposed to do. I know Dr. Serena says that ulcerations must be kept moist, but not too moist, and it's not easy to get the right balance all the time.
Write to Dr. Serena if you need to: http://birthmark.org/experts.php
He's listed as the Wound Care Expert. Also, write do Dr. Nelson with questions about laser treatment, if you have any.