RE: Air pressure for retracts
One of the quirky things about retracts is the housing they're in.
Before I go on, I have a question: Do they still require 60# of pressure if they are not installed?
If they work down to 40# when not installed, but need 60# when they ARE installed, then it sounds to me like the housing is getting "tweeked" as it gets tightened down.
IF that is your problem, a simple fix is to smear some wood filler on the mounting rails, then put strips of waxed paper on each of the mounting tabs on the retracts and gently, but firmly press the retracts against the mounts (Don't screw them down). This will let the wood filler conform to the shape of the tabs on the retracts.
Now remove the retracts and the waxed paper and let the wood filler dry - then, reinstall the retracts.