Did you guys get this issues resolved? A friend has been having this exact issue with his as well. Booster/MC replaced and I believe there was a, or a few hard lines replaced. Started wit the pedal just not coming all the way up (brake lights on), now he says the brakes are sticking as well. A friend of his thought it could be the soft line, said those lines get weak and break down inside and become really soft.
I've not had this on any of the JK's I've owned, but trying to find a solution for him.