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You may want to replace the 4-way. maybe it is leaking but you bypass it when you're testing. They may leak where the plastic line slips into the rubber 4-way. Just a guess.
If you're sure the door lock circuit doesn't leak you may want to isolate the lock circuit from the other systems with a devoted check valve. Maybe you're missing a check valve as I was when i bought my 300D. Single port (see attached) vacuum check valves are not too bad ($6.41).
Why do you keep taking the door panels off. You should be able to isolate the problem without doing this each time. I assume you have a vac pump.
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