Don't take them anywhere !!
They sound perfectly healthy. They certainly grew well and on schedule, they changed from mice to rats, sounds like well adjusted and lovely snakes to me.
I would go to feeding one approp. sized meal once every 5 days and once they hit 450 or 500 gr. once the week.
Could the popping come from their body? With the almost non-stop digestion they have going on you will sometimes hear strange noises from their body, esp. when you handle them. If you feed twice the week you shouldn't actually be handling them very much. You shouldn't handle them on the day of feeding and the day after. But yes, if you pick them up while they are full of rodent parts, stuff inside re-arranges and sometimes "pops".
If the pop is coming from the head area, make sure nothing is in their nostrils, no small pieces of substrate, etc.
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