Brake drag. Need help.

Pushrod could be too long; same deal; compensating ports not open and fluid not returning.

To minimize drag,
I set my wheel-bearing adjustment to the max. This allows the discs to knock-back the pistons a couple of thou. This works on my fixed calipers, the KH 4-piston set-up. I would guess,not so much on the floaters. From 60mph, my car will coast down to 30ish in a half a mile or so, engine running, in Neutral, with a 4-speed,on concrete.

After you get it sorted, if it was me, I would deglaze the cooked pads. This is nothing more than shaving off the hardened part with emery-cloth.