You wrote "running high wattage AC appliances at 120/240 60 cycle"
Whoa, so what you're telling me is that you're sailing a condominium, Hmmmmmm. I guess my general advice is falling on deaf ears. I once knew some folks who owned a Bristol 36 with all the bells and whistles...hell, I think the thing even sported a trash compactor. Anyway, they loved that boat until it started to s_it the bed on a regular basis and they spent many a beautiful weekend tied to the dock trying to fix the trash compactor or whatever, rather than sail. They never did learn how to sail that damned thing.
Bon chance, my friend.