I too have a family of 5. I based our tips on an average of meals that I thought our family would be most likely to order.
I figured up:
Sat Arrival QS / Narcoossee’s ($40 tip)
Sun MK BB Boutique / QS / Cinderella’s Dinner (tip included)
Mon DHS QS / Prime Time ($85 OOP including tip)
Tues DTD QS / Boatwrights ($25 tip)
Wed Epcot QS / Royal Banquet ($25 tip)
Thurs AK QS / O’hana ($25 tip)
Fri
MNSSHP QS / Animal Kingdom / Rainforest Cafe ($120 OOP including tip)
Sat MK QS / Whispering Canyon Cafe ($25 tip)
Sun Depart QS
I will pack poptarts, cereal, and oatmeal for breakfasts. Will need to purchase a gallon of milk. ($5 - I have no idea the costs there)
Last trip, we were very thirsty and mostly used our snack credits on buying drinks. I am going to add in an additional $3 per family member for snacks per day. ($15 x 8)
So that's around $500 for food.
If I wanted to fork out an additional $800 I could get the DxDP I could drop off $330 and then all table service would be added $400 in tips.
So in total the DxDP would cost us approximately $1100 more.
As you can see most, if not all of my table service meals are Dinner. I would use your table service for dinner and then pay oop for breakfast. Check out the menus, make an average to decide how much money for each meal, and then use your quick service for lunch.