Cheshire, I don't know about lactoferrin, but I am using a product called "mastica" by Allergy Research. It is from the gum of the mastic tree and supposedly kills only the bad bacteria in your gut. I have been having some good luck with it. It has been hailed to kill h.pylori in the stomach, but kills other bad intestinal bacteria also.
It sounds like you have trying to change dysbiosis into a better situation. I have been working long and hard on this and have changed mine dramatically. If you care to contact me, I will try to tell you some of the things I have done.