Thanks Colin I have also browsed the paper you linked but will give it a thorough go over and get back to you if anything stands out. This is a great thread. I have pondered the deeper meaning of a soil chemistry analysis for some time and believe that they are often not fully understood.

When you speak of your CEC being too low to attempt to achieve balance are you saying there are no more exchange sites to add cations to in order to achieve balance? With your low pH, how about knocking off some of the hydrogens to make room?