Make a thread in the Battle Board where one can just post the calculations for a round. Example:
Khajmer vs Paperfairy
Deoxys used Slap [-4 HP Dialga/-18 NRG Deoxys]
Dialga was fully paralyzed [-20 NRG Dialga]
Then, a writer is free to post in the battle thread itself with the full round, using the calculations. When everybody is paid, we can pay individuals that did calculations, and then pay refs based on whether or not they did the calculations.