It would be a good idea to continue Metro for a full 12 days. Up to almost double strength on the package. At this point, if it were me I'd stay away from de- wormer until you can get them eating again since a dewormers can cause appetite loss. Just one question. When do you put the prime in your aging barrel? Hopefully just prior to using it. You mentioned every other day WC, that's why I ask. Others will chime with their experiences.
Up the temp. to 86f