Documentation about "drag stabilized flying wings using non-reflex airfoils"?
If you’re going attach a boom and surface, why are you comparing to a reflexed airfoil?  Attach the boom and surface conventionally and you get far better LD than either. The effective trim drag is lower. And you can get it thru the door of the hangar.
  Planks are cool, but applying the restoring force without much lever is the basic problem. The required force and resulting drag is much higher. 
  The new config exposes the whole boom to flow and the vane is 100% drag. A conventional surface generates force with the L/D of the tail surface, only 20% drag if the LD of the tail is 5. 
    Conventional boom or even a swept tailless is far superior to this config or reflexed plank. I don’t think anyone will spend time calculating the diff between two poor config. Sorry.