It may be the fluke after all. When the fluke dies and exits the fish body, it leaves some wounds on the body. When the wounds are healing, the fish feels itchy, just like in human. If that's the case, then scratching is normal.
Another possibility is marine ich. I saw it before that fish had marine ich was scratching but the symptom (white dots) wouldn't show up a few days later. So watch your fish closely in the next few days.
On a hind-sight, I wouldn't start the the PP until all fish are eating and fat. PP can suppress appetite for some fish. Also it's very safe to dose full dosage at once.
Good luck on your remaining pair.
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