Given your situation, doing a lot of sit-down dining, getting Tables In Wonderland is probably your best bet - assuming you are a
DVC member or annual pass holder. That nets you a 20% discount (including alcohol) at the sit down places, and still leaves you flexibility and kitchen use for the rest. Be sure to factor in the $150 cost for Tables In Wonderland into your math. We just did a similar trip (9 people, about the same number of sit down meals) and found TIW to be very cost effective saving us several $100.
In general DDP doesn't make sense unless you are able to spread the credits between more people. For example, we're heading to WDW in a couple of weeks - if we got DDP we'd have to pay for 28 person/days. But our group has 41 person/days of bodies to feed. So, in this case the DDP starts to look attractive.