Never had a problem with those calipers and many of us have run them for years. Your rubber flex brake hoses maybe collapsing inside. This would not let the fluid return to master cylinder and will hold the brake on. Just a thought.
Once a turn is made, or a bump is hit they back off more anyway.
If you pull in and stop the car with the brakes then jack it up and pull the wheel is when the most drag is felt.
If you really want to see the "normal" amount they drag, pull in and stop the car with the E brake and THEN check the drag of the discs and it's a lot less.
(as long as everything is ok, and no piston sticking, line collapsing or a master plunger adjusted up to tight.)