Bruce H. and Renojack,
Your load transfer measurements are being discussed on AIR Forums beginning with
this post. Thought you might be interested.
Renojack,
One of the AIR Forums members (post 163) adjusts his WDH by using the tongue jack to remove load from a chain and then turns the adjusting nut by hand.
Have you tried that approach to get more compression of the urethane springs.
Do the instructions say anything about using this approach versus using the wrench to load the springs?
This member (post 163) assumes that you have installed your brackets at the wrong location -- implying that might be the reason you cannot get sufficient load transfer.
Ron