I wormed them because they had diarrhea and a 'flock fecal' test came back positive for worms. Diana didn't have diarrhea and I wormed her anyway. She continues without diarrhea. Maggie and Dotty had diarrhea and still have diarrhea after being wormed. They seem fine with it.
Minnie however was really ill. As well as diarrhea she was lethargic, not eating and looking like she was ready to breathe her last. It was because of Minnie's condition that I pursued fecal tests that eventually showed worms (and Cocci).
After being wormed Minnie's crop stopped working (side effect of worms? or of worm treatment? or just a coincidence?) and her full crop geot yeast overgrowth ie sour crop. Minnie's crop seems to be working again (I am hoping it stays that way), and she is no longer lethargic - in fact she seems quite zippy! But she still has diarrhea.

I think if Minnie and the others stay well and the only symptom is diarrhea I will ignore it. I can try the lower protein food but I doubt it will make much difference as most of their food is forage right now.