Mary, I don't know how you knew that, but being a Master Gardner is just a title. I am no more knowledgeable than the average grower. My knowledge basically comes from doing and I love to experiment.
David, it sounds like you have a nice set-up, an almost commercial set-up in fact.
One thing you mention is running fans. That is something that the vast majority of tropical plant growers forget about. It isn't important in the germination but it sure is important when it comes to growing those seedling. Stale, stagnant air can be the death for many plants. Air movement is so important to help prevent fungus, bacterial, and pest problems. I have very little problem with any those things, and I am positive it is only because I run so many fans. I seldom (almost never) use fungicides or pesticides in my greenhouses.