My suggestion would be to pay OOP for the Aloha Dinner Show.
The Dining Plan costs what, about $36 per adult per night? Two TS would then cost you $72; and the cost of the Aloha Dinner Show is only $51 per adult. (Obvously I'm not taking into account the cost of your snack and lunch...)
To me that's a waste of a credit knowing I can get another lunch or dinner out of a TS credit.