Since you have park hoppers, what I would do is do Epcot and HS one day and AK and MK the other day (the day that has evening EMH at MK if you are staying on site). HS is a must for us. ToT is my favorite ride, and really, this park is my favorite (reports of "everything" having been closed are greatly exaggerated, the vast majority of attractions are still there). AK I can take or leave, but we do like EE, so usually manage to plan for a couple of hours one morning. We do these kinds of trips most of the time, with just two or three park days (usually over a long weekend). For the AK/MK day, I would start at AK with rope drop and quickly hit up whatever you want to ride/see. I would not plan to use any fastpasses here. We usually go straight back to Kilimanjaro Safaris, then come back up to Expedition Everest for a few quick rides via the single rider line, then maybe hit up Dinosaur and Primeval Whirl. If the line is short, we might also do a run on Kali River Rapids. Usually within 2-3 hours tops we have done what we want to do at AK and leave, taking the bus to MK for the rest of the day. I have our fastpasses scheduled for MK for early to mid-afternoon so that we can use them shortly after arriving at the park and then start seeing what we can get as 4+ faspasses, and then we ride standby in between those. Works well for us. For the Epcot/HS day, we tend to start at Epcot, stay through lunchtime (having lunch at the Mexico quick service), then take the boat over to HS. We get to Epcot at rope drop, ride Soarin' stand by, ride Test Track a few times using single rider, then do whatever else we want to do standby. This last trip, Frozen was new for us and I wanted to ride, so we hightailed it straight there at rope drop and were able to ride with a less than 15 minute wait, then went over to Soarin' for two rides via standby with little to no wait, then over to TT single rider line for two rides. Worked really well for us. For a day like this, our fastpasses are scheduled for early to mid-afternoon at HS, again so that we can start using them upon arrival at that park and then start looking for 4+ fastpasses, riding/seeing other stuff on standby in between. For a two day trip, something like this is pretty much what we always do and it has worked very well for us. We like to skip fastpasses at park #1, instead choosing to take advantage of short standby lines early in the day, then using our fastpasses at park #2. That has been my strategy for each trip in the FP+ world and we both think it works well for the way we like to do parks. We are two adults, no kids, so we tend to open parks and close parks, and no mid-day breaks, other than the built in break of hopping parks. You mentioned your trip is April 2017. The new section of AK, Pandora - The World of Avatar, is scheduled to open "Summer 2017", which I would take to mean sometime between Memorial Day weekend and September, so I would not plan for that to be open during your trip.
