not stopping well

[GNTIM]

I scrambled the left rear brakes during a high boost foot brake launch a while back. So I replaced everything in the rear and also the front hoses, pads, rotors and calipers. Now when I stand on the pedal, the car stops but not like it did and there is no wheel lock up. I replaced the proportioning valve and the accumulator, the brake pads thinking maybe I didn't brake them in right-plus bled the car nine ways to Sunday but no help. Everything else is good. HELP

 

[turbo nasty]

How did you break in the pads/shoes

 

[GNTIM]

Power braking at high boost. It looks like the backing plate warped during the incident and everything tweaked. Had the same problem years ago with the other side. You'd think I would have learned