I still would call Master Power Brakes and go over your system with them, it will only cost a phone call. I still am a firm believer in swapping known good for known bad, pull off one rear caliper and one front and swap them, put a socket in if you want to simulate the rotor if they won't bolt to the brackets, neither of these will cost a dime, and will tell you if its a valving or line issue (backwards RPV?). Just my two cents worth that I have mentioned long ago, I am sorry for your trouble but throwing money at it is something I have done before as well and it is not always the solution, could be your old calipers where fine.