Some flow from the brake valve in the off position should be OK as long as it does not build pressure. I think you will find that your problem is in the return springs. They almost always need to be replaced when the linings are replaced. Your old ones may feel OK but if you match them up with new ones you will find that they are now too short.
As the brakes are applied the piston pushes against the adjuster plate which pushes in on the springs. The more the linings wear the more the springs are collapsed. When the brakes get hot the springs will lose some of their temper and no longer apply the same pressure to retract the piston allowing the brakes to drag causing the brakes to get even hotter.
The brake adjusters work to limit how far the piston is pushed back into it's bore. If there is a problem with the adjusters it is usually either that the brakes are slow to apply because the piston has retracted too far and takes too much oil before applying the brakes or poor braking because the adjuster screws are seized they are keeping the full pressure of the piston being applied to the linings.
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