With only one room at the CR you will be over the limit of 5 people unless your DH will remain back at ASMv. With 6 in the room I think you will be pretty cramped and someone will have to "camp out" on the floor as the day bed is not really big enough for 2 kids. If your youngest is just 3, then he could possibly sleep in the pack-n-play. Plus, the whole idea of 6 people and one bathroom

.
Now that's out of the way ... maybe.
Edited: I just saw that you will have only 1 "Adult" child, the 10 year old. The other 3 (8/6/3) are all "Child" children according to the
DDP. That makes it more borderline in terms of $$. I think you would probably come out even because of the value of the DDP for the room of 2 A and 2 C is $100 per night.
The only problem is that I am not sure that you will still be eating all your appetizers and all your desserts by the end of a 10-day trip! Also, know that you can use your credits until midnight on the day that you check out, so you can save credits and use them on the day that you check into the CR.
It
may make sense for you to keep the single ASMv room just for the dining. Put your husband, the 1 "adult" child and two other kids on the ASMv reservation. Put the youngest child and yourself on the CR reservation. So, in DDP speak you would have 2 A and 2 C on the ASMv room. Then, you can use those "adult" meal credits any way you like. You can even use them for you and your DH those final 2 days if you wish. You can also spread out when you pay OOP for the 2 "Adult" meals and the 2 "Child" meals over you entire stay. I would pick a character breakfast or maybe a 2-credit meal if you have one. Something cheaper.
I made up a spreadsheet to help me plan my DDP last year. I think it might help you:
http://personalpages.tds.net/~rb/DIS/MYW%20Dining/MYM-Dining-Planner.xls
The following will make more sense once you look at the spreadsheet ... If you were staying all 10 days at ASMv you would enter 30 Adult Credits and 30 Child Credits into the spreadsheet. In your case you would enter 28 Adults Credits ((2 * 10) + 8) and 28 Child Credits ((2 * 10) + 8). There are places on the spreadsheet to note when you will be paying OOP. When you do pay OOP, you will have to ensure that the CM removes the correct number of credits from your cards. It might be easiest if you pay OOP for one adult and one child in the same two meals.