Are you stopping the door completely then testing the force? Kinetic energy is computed by the weight of it's mass and the square of it's velocity. Perhaps the door weighs more than they engineered the door package for. When I test doors for closing force, I stop it 1/3 or so in it,s travel and put my gauge on the leading edge. The force to hold the door stopped with the gauge is the force. Make sure you are using a good gauge.