I think you have it right by going to EP the first day, getting there later, and leaving out AK. If you go by ride or show attractions, AK only has like 8 excluding the kiddie ride in Dinoland and including Tough to be a Bug and the Up bird show. There are the two trails, but Lion King, Nemo, and parts/all of conservation center is closed. HS only has about 8 attractions that we'd go on, excluding Muppets and Alien Saucers for us, but it's tough to skip with RotR and MMRR. EP actually has more than both AK and HS for us, including 3 amigos, shorts, Canada show, that we actually see/ride. It's sort of surprising when you tally them up.
We have a 6 day stay and we have AK currently as our last half day because it's open earliest, with 1 EP day, and 2 ea. MK and HS. We are considering changing the 2nd HS to something else, though, with all of the reports of HS being more crowded/the most popular. We haven't experienced MMRR yet, but we go every yr., and I'd even consider a 3rd day at MK with the light crowds we may never see again.