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A restricted pathway would delay braking force, but not prevent it. If you held steady pedal, the cans would fill to the delivered pressure eventually and provide the associated braking force for that pressure. Of course the quick check for volume is to simply disconnect the line at the can...

Wedge brakes, no zerks or cams, just rollers between the wedges and plungers, and you need to disassemble them to get to those for fresh grease...

The LSPV only effects rear pressure delivered to the cans. It won’t increase front pressure as the front and rear systems are completely separate. Actually i would strip off the front drums and actuators and inspect the wedge mechanisms(And once the front’s are done, I would do the rears...

You can see the shoes move outward toward the drum when you step on the pedal right? need a feeler gauge to check the gap between shoes and drum. You are looking for .020” between shoe and drum measured in the middle of each shoe arch. it seems weird that the spring brakes would hold but...

Last symptom has to do with the anti-compounding valve and is perfectly normal. The rear wedge mechanisms can be damaged if both park spring force AND service brake force are applied together. If no park air is applied to release the springs, the anti-compounding valve applies it when service...