Ok seems chaning the direction of my fan from blowing from the back of the fridge out over the freezer plate to blow from the keg box into the fridge over the freezer plate as one of Steve’s pictures suggests and adding the fans in the rear over the compressor helps a great deal. I’m now able to get to below freezing temperatures in a few hours on a 36″x20″ keg box with a medium setting of a 2.7cu Fridge.
For others reference, I started out with the Fans from radio shack but they are a little loud and I found something 20% quieter and 10% more airflow for a few bucks more here:
http://www.stayonline.com/detail.aspx?ID=8353
Pluse those are ball bearing instead of sleeve bearing and come with fan guards, mounting hardware and cords. Also the 120mm size fan fits perfectly snug in the Freezer plate space of the Haer 2.7cu Fridge with no mounting hardware.
Still interested about the relay though as 3 x 120MM fans running all the time is still noisy even at 32db each.