I never planned a week long trip before, but If I would here's what I'd do:
Option one I'd scrap either Seaworld or Discovery Cove, probably Seaworld. I know sometimes it's hard to make the decision but it seems you're trying to cram too much in your schedule.
Day 1 - Fly in, relax
Day 2 - Universal Studios
Day 3 - Epcot
Day 4 - Animal Kingdom till 3PM, rest of the day off to enjoy the resort.
Day 5 - Islands of Adventure
Day 6 - Relax at Discovery Cove, then have dinner at Medieval Times
Day 7 - Magic Kingdom
Day 8 - Morning at DHS, leave
Option two, with Seaworld.
Day 1 - Fly in - half a day at DHS (it'd be better if you arrive at the park not after 2PM)
Day 2 - Sea World
Day 3 - Epcot
Day 4 - Animal Kingdom till 3PM, rest of the day off to enjoy the resort.
Day 5 - Islands of Adventure
Day 6 - Relax at Discovery Cove, then have dinner at Medieval Times
Day 7 - Magic Kingdom
Day 8 - Morning at Universal Studios, leave.
Day 4 and 6 would provide some rest between all the excitement and you still would be able to enjoy the parks to the fullest. The difference between a 3 day ticket to a 4 day ticket is less than the cost for the hopper you'd need to go from AK to DHS and you wouldn't feel as rushed.
Universal is better done over two days, there's a lot to do in both parks. Plus you'd have time to eat at Citywalk or one of the hotel restaurants. There's some great new options on Citywalk with excellent food.