Sounds like you need to settle them in and get them back on a shcedule, the combination of winter, relocation and possible larger meals/fat storage can make a girl go off feed. I have also witnessed some snakes that hit the 900 gram mark and go through a finicky period, like Brad said, not all but some, I have a pastel girl that is doing that now so I am feeding her smaller than normal meals and she is responding better. Have patience, they should be fine if husbandry is correct.