Try checking this page:
http://avid.force.com/pkb/articles/en_US/download/Eleven-Rack-Drivers

I think you are just ahead of Avid's suggested or qualified setups for both the 11R and Protools. You may want to contact Avid support directly (if you haven't already) to see if they have suggestions, or at least a goal of supporting your version in the future.

Since your computer configuration is not listed as supported, they might not be able to give you much help, but you never know.