There is no formula, however in the thread and my videos I talk about the more creatures the better Rewards you get from a paddock.
The data shows that 1 VIP creature in a paddock should get you about 275 DNA (400 if perfect) and 5 SDNA. 2 VIP creatures gets you 305 DNA (390 if perfect) and 10 SDNA. But to be fair I do not have data on straight level 10 VIPs in that my single paddocks has at least a level 20 creature and the data I have with two creatures one was at least a level 20 as well.
For Super Rare you need 4-5 creatures in the paddock to get the same DNA option of 275.
Rare you need 8+ in the paddock.
And again for all of these I didn’t have just 8 level 10 creatures or 4-5 level 10s. They were all combinations of level 40, 30, 20, and 10.
But the data is there to comb through and use as you see fit to chart a path forward on how you want to optimize the Code 19 function of the game.