Hi WillsC:
I planted my fig hedge at about the same spacing for the same reason (we could try more fig varieties in less space). So far it is worked out very nicely, and I have been able to prune them to a nice hedge, easy to pick (walk up one side and down the other), easy to water (I run a soaker hose down the line), and easy to prune (well, like a hedge).
Hope you enjoy this as much as we have. Other than having trouble with too much splitting and rotting last summer (too much rain at all the wrong times last summer; and nothing to do with the hedge of course) this project was a total success. We finally realized our dream of having too many figs! ;-)
Best wishes.
John