The JC stuff dries my hair out too after a while.
With the deva stuff make sure the low poo is getting that A cone out. Most do fine but some find it builds up on them.
And then there is the weather. It's been dry here so it was hard to keep my hair from being dryer than usual.
I'd try an Acv rinse and see if that helps. If not then clarify with a sulfate shampoo and then do a good DT after.