The contactors, unless latching would eat up any savings that you gained by killing all power to the other appliances, there is a fine line between saving energy and getting ridiculous, The things that you previously did, like adding more insulation are doing far more to save energy than unplugging clocks and microwaves. Turn off the a/c one day a year and you have done 10 times more than what you did removing parasitic loads. Turning off the playstation when not in use is good, as well as shutting down computers while not in use. Don't sweat the little stuff unless you have nothing better to do. It's just like global warming will flood the planet, it is mathematically impossible.