When asking Adam, of Flying Fox Fruits, which organic fertilizers he likes, he recommended Turfpro products. They have a few different products, but they all focus on microbe activity, which is what I am looking for. They even have a turfpro with chelated iron!
Just placed an order for: Turfpro w/ Iron, Indian River (a fish hydrosolate), and the agripro dry fertilizer. Will try to update after using it for a while.
If you are considering purchasing, contact them, and tell them Adam recommended you, and you get a 10% discount.
Just FYI