Very cute cresties 
! I was having trouble with my little crestie not eating enough too. I use Pangea Insects MRP, Fig and Insects, Watermelon, Growth and Breeding, and Repashy MRP. If you freeze them in glass jars, they will last a really long time.
He ate all of these, but just not enough. Now with the helpful suggestions of some other people on here he is eating great. What I recommend doing is buying Repashy Banana Cream pie, and 100% natural organic bee pollen.
Banana Cream pie is a great mix-in and not a diet. And bee pollen is addicting to cresties so be sure not to do that to often. I can noticably tell that he eats more whenever I add either of these in. You might find some helpful tips here. Good luck to both of your beauties 