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I guess I cannot really be of much help because I live in zone 9A, Texas Gulf Coast near Houston. In our climate, amaryllis are planted outside permanently and bloom in April or so as a matter of course, including Papilio. Maybe it resents being moved or it is not getting enough cold or warmth. Fertilizer? One problem I have every spring is a type of rust that infects the leaves as they emerge. I have to spray with physan or I will not get flowers.
This September, to my astonishment, one of my Amaryllis (San Remo) bloomed as though it were spring. We have had a strange summer this year that some of us feel was due to hurricane Ike. Anyway, if it were me and I had to battle so much to get something to bloom, I would stick with something that does bloom in my climate. That is why I don't mess with tulips, hyacinths and most daffodils. Too much bother.