Ouch!! [img]/forums/images/icons/crazy.gif[/img] Don't pull any punches guys.
I knew there would be a recommended percentage and 80% makes sense. I did put in 3 gang switch boxes and now I'm glad I did. I intended to use the other two switches for outdoor lighting, but they'll be needed to fix my original problem as you recommend. The walls are all bare studs, so more switches and wiring really is no problem.
I'll plan to use 15 a circuits with parallel runs as suggested. Most of all, I appreciate the lesson on proper design and forethought [img]/forums/images/icons/smile.gif[/img] I certainly underestimated the amperage necessary to power 500 watt fixtures.
I assure you it'll be done safely with your advice.
Thanks again,
Leef