Well since you are stuck on mice for the near future I would just say weigh out those adults and feed as needed to size. The great thing about perfect prey is you cna order small quantities of a larger sie with your larger quantity order. The shipping is more than big cheese but that makes it great to test out a larger size or swapping to say rats.

Too bad ex breeders are so much bigger or you could just try those once or twice but it seems like you are at that awkward weight with your snake where you are between prey size.