.... Here is what I have found out in my conditions .
Mine did not like to be grown with the regular size Catts . I had to shade them more or the pots dried to fast and not having the leaf mass of the large ones the leaves dried out , I think the problem is the little pots not holding enough potting mix (moisture)to repel heat from the roots . Can you keep them indoors where it is cooler ? might be better off . Or sit the little pots in a larger one and add Spag. between the 2 pots . Gin