I just was looking at my plans and actually the plans call for 6 tons, not 6.5. The plans I have only have show boiler plate mechanical specs (latest edition of UBC, etc.) but on the electrical page it does reflect 6 tons when caculating the electrical load calculation and service panel requirement.
The house has 24" overhangs and very little window area on east and west. The house is front to south, back to north.
I really appreciate all the helpful responses. I'm going to ask the archiect for the Manual J and D (if they exist) and post some of that data here.