Did you use those rusty rotors, calipers, and pads as shown when the axle was on the jack stands? If so I would at least get some better rotors and new set of pads to start with.

Make sure the calipers are installed correctly with the bleeder screw on top, seen a couple of people make that mistake and have them outside down.

My brakes work fine with the 35’s and stops on a dime with the stock MC. I used new rotors, pads, and rebulit calipers. My SAS pathy didn’t so much until I install a Proportioning valve on the rear line. ~ $40 from summitracing.com The waggy calipers need more pressure so my reducing the rear pressure more is given to the front.