Barry,
Welcome to the board.
I selected the Halcyon 55# Explorer as my primary wing. I added another Halcyon Explorer as a secondary wing. I dive dry but do not feel comfortable in open water on a wreck or in a cave without a redundant wing. I have a streamlined profile according to observers and do not notice additional drag.
I believe that the dual bladder wings are OK, but they seem too bulky for me and if you were to damage the wing in a wreck you may get both bladders. I know that the DIR folks don't agree, but I think Deco stops would be mighty tough using your drysuit for buoyancy control.
Whichever solution you select, I think you are making a wise configuration decision.
Just my $.02.
Larry