You are struggling to get their systems back to normal from what?
Molt can sometimes take months to complete, there is a very wide range of normal. There is also a wide range of normal for when molt can start, some birds start in the dead of winter. I would stop treats for a few days, just feed the regular feed, maybe give a bit of scrambled egg for a treat and protein, and see if the droppings firm up. Adding a probiotic may help. Is every dropping like that? If you have a vet that will do a fecal test for you that would let you know if internal parasites are an issue, they can cause runny droppings.