I certainly don't know, but why do I have the feeling that "every single time" is an overstatement? So if I understand you right, "every single time" you're running early, told to slow down (by dispatch presumably), are still early landing and end up late getting to the gate because of delays on the ground? Never running late to start with, never late getting into the destination airport, just to the gate? Not impossible, but statistically improbable.
I used to fly engineer and then fo for a captain who I kidded after I checked out. I'd tell him that he had his share of problems with airplanes and my share too, since it seemed that almost everything that could go wrong with an airplane happened to him while I had little go wrong. Maybe you're like him and have a dark cloud following you around.
Jim