A good clue on rear shoe adjustment causing this is to set the E brake when parked and then the next morning go out and hit the brakes.
If it's fine, then you have a rear shoe adjustment needed.
The E brake holds the shoes against the drums to they don't collapse the cylinders back down.
I tried that trick or clue with having e brake on and it still travels pretty far, I'll pop off rear wheels tonight but I'm starting to think mc or I need to add residual valve
