The two kinds of waste in charging are overhead, which wastes power at low charging speed, and heat generated in the batteries, which wastes power at high charging speed. I think the default charging is 40A because it is a very good balance between the two. Either way you still don't need to worry about the home theater setup as it can't draw enough power for long enough without deafening you. The real concern will probably be those air conditioners and hot tub. Do some calculations and you should be set at 40A. I had to do similar calculations to support getting both of my charging setups in place since there are currently two EVs in the house with a third to come.