not surprised with the 2 servos.... bin them, you wont feel a pedal at all with them and wont know what the brakes are doing... also can you put a pic up of your rear brakes, need to see the pipe work...

I have race cars running that set-up and the drivers can lift the rear axle up on hot slicks, so i would say its a minor problem you have with them, also have your front calipers got the bridge bolt to hold the pads in or a pin..