I would recommend researching the techniques being used by Cesar Millan.
He maintains a pack of up to 50 dogs at a time. Including pits, rotties, and many other breeds. I have been very impressed with what this man has achieved, and have attended one of his seminars in CA.
He has a show on the National Geographic channel called "The Dog Whisperer". If you do a google search of "Cesar Millan Dog Whisperer", this should take you to some sites which contain his basic philosophies.
See if anything he has to say, makes sense to you.
I'm not suggesting you use his hands-on techniques without the help of a professional, but what he has to say about dog psychology, canine communication, leadership, and the "power of the pack", is quite enlightening.
Good luck!