Obviously a lot of this depends on your traveling party (children's ages, if any, etc).
With option #2, if you're taking day breaks during the week, and you plan to take the morning off on the day of MVMCP, then you probably don't need a whole off-day like in option #1.
Rather than take an "off day," I would just see how I feel later during my stay. If by day 5-6 the tank is running low, just take some extra time or sleep in late one morning. Sleeping in late one or two days, then heading to the parks later instead of for early morning (or rope drop) can make a big difference. Those extra 2-3 hours of rest in the morning are almost as good as a break day.
Not to mention the idea of AK during the day and then MVMCP at night seems like a really long day. And I don't like to cut back on AK... there are so many things to see if you take your time there - Flights of Wonder, two musicals, Planet Watch, the walking trails... some of the best things about AK require a lot of time. I think you're better off with the "AK/DTD" choice, because you might find that you want to stay at AK until closing, and then DTD can be later or just skip it since you have another day scheduled with time for it.
With only 7 days, I'd stick with the plan that gives you the most park time (#2). If you schedule a day off on day 4, you're risking the potential of wishing you had more time in the parks. At least with option #2, you can always scale back if it's too much.
And this is why I'm staying 14 nights in September. You can never have too much time