new rear disks, need more "bite" - any suggestions?

Need to consult the Ford Explorer Factory Service Manual, or some other service manual, for the proper installation and adjustment of those brakes. I bought a rear disc setup from The Right Stuff for a Nova; their kit was from a Cadillac DTS. The calipers adjusted similar to drum brakes - had to ratchet. Not sure what Ford does.

Like others have stated, could be proportioning valve. Might need a different MC.