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Has been working perfectly for me too in more than a year now.
I do believe though, that the original reason is, that the pump doesn't have the capacity it used to. But I also believe, that you can continue to do the trick until it can't close the doors anymore.
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Yeah, it probably is a combination of slow wearing of the pump head and minor leaks developing in the actuator pistons that decrease the pump's ability to develop pressure. But, you only need enough pressure to close the door. As long as door latching occurs fast (within 1-1.5 seconds), the pump is providing plenty of pressure. This is the first thing to evaluate in my opinion. For some reason, it seems the factory spec calls for the pump to develop really high pressure. Because of that, it doesn't take much wear or minor leakage to drop below that. But, the doors will close well-below the factory specified max pressure set-point. I suppose the engineers wanted the doors to still close even if the latch became very sticky or difficult to close for other reasons (either some rich fat guy leaning against the door or maybe the body of a mafia hit wrapped in a rug
).
And, yeah, no reason you can't open it up again in 5 years and adjust lower once again... as long as the doors still close.
Mine's been 100% reliable for 2 years now.
Brett