I have resolved this issue and update the plunk to reflect a working solution. The problem stemmed from the fact that multiple instances of the form were concurrently displayed via ng-repeat. Consequently, the ng-class 'validation' logic was never looking at the proper instance of the associated form fields in any case but the very last one displayed. I modified the behavior to use ng-if to conditionally include the fields only if on the appropriate $index of he ng-repeat. This corrected the issue and is now working properly across all instances.
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