To recap brake setup currently, you have designed in the four piston caliper from Dodge and the Dodge rotor as well or did you change it to the Mustang rotor for the bolt pattern?
I used the Dodge rotor. Bolt pattern on the LX/LC cars is a conundrum, but they fit fine over the Mustang hub. Only issue is the center bore on the rotor is a touch bigger than the pilot on the Mustang hub allowing the rotor to move around some. My plan is some feeler gauge material cut down to make small shims that center it up until the wheel is bolted down and are captured by the wheel.