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Cavity Width in Masonry Walls

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Does anyone have any experience with large cavities (>3") in masonry cavity 
wall design and construction? UBC permits up to 4 1/2" with the proper ties, 
but NAVFAC P-355 restricts cavity width to 3" unless spot mortar bedding is 
used to stiffen the ties. We have a project with CMU backup, 2" insulation 
and clay brick veneer. To get a clean cavity, the architect has specified a 
2" air space for a total cavity of 4". The Navy said no to any more than a 3" 

The project is located in Norfolk, Virginia (Zone 1).

Bill Keen
Clark Nexsen