Both kids are used to full days at theme parks such as Kings Island and can rest during meals and/or stroller nap.
Your 2 y.o. & 6 y.o. have experience with 3-squares a day at sit-down meals over an 8-day period?
I tried getting past your first day:
-- Awake and out of room by 7am.
-- Buffet Breakfast from 8:05-9am
-- Rides and attractions from 9am-11:25
-- Lunch at Prime Time 11:25-12:30 (with huge portions)
-- Rides and attractions 12:30-4pm
-- Three-course dinner 4-5:30pm
-- Rides and attractions 5:30-8pm (or later)
-- Fantasmic 8:30-9pm (or later)
-- Back to hotel 9:15-10:15pm
Add it up - that's more time traveling and eating than rides and attractions. And I've only assumed 1-hour for the meal.
Now - you plan on a similar 2nd Day. Awaking early for breakfast and continuing to a 'hard ticket' event that will last until midnight.
I really don't mean to sound snarky, but how is this a vacation?
If you really have to use DxDP - the math works if you do Characters & Signatures.
Try the math again - have room service for breakfast, Characters for lunch & Dinner, and squeeze in as many Signature as you think a 6 y.o. can sit through and a 2 y.o. will sleep through. T-Rex, Coral Reef and most 1-credits are a waste of your money.