I know this is not going to make me very popular… unfortunately they are rather strict on party size. The A La Carte restaurants have a 10-person maximum. The buffets are larger and they may be a bit more accommodating, within reason. That said, there are no reservations at the buffets and will be subject to space and availability.
My suggestion… schedule smaller, more intimate group meals. If you want a bit bigger group, hit the buffet. If it is a really large group, consider going to the pool instead of dinner.