It is good that you are doing calcs, dont get me wrong. Some AHJ's will want to see them, and good for a sanity check now and then. From a practical standpoint, its typically going to be 100 amps to each unit, and a 200 amp-ish riser for this sort of thing. I just started almost the exact same thing as this minus AC yesterday, and that is what I am doing (thankfully, I had to talk him down from wanting 150 or 200 for each unit. I should print out your load calc and show it to him )
Ethan Brush - East West Electric. NY, WA. MA
"You can't generalize"