those are fantastic weights! baby looks beautiful
i am an accidental gran too. you need to take the male out for a few days - if they are his babies and he's still fertile, you could have more on the way as the ladies go into heat after giving birth. when we found out fluffy was a girl (we thought we had two boys), we had three babies and she was already pregnant with another baby (we took the dad out the same day).
weigh them every day - that way you'll know if there's something wrong. fluffy had mastitis after the first litter and was unable to nurse so we had to take over for a couple of weeks until she healed. babies do make noises and so does mum so don't be alarmed. also,they will most likely lose a few grams in the first two days as the milk can take up to 24 hours to come in, after that, they should be steadily putting on.
you can handle them straight away, chinnies don't reject the babies if there's 'wrong' smells on them. for the first few days it's probably a good idea to keep handling to weighing but you can increase the handling time later on. some first time mums are possessive, mine was perfectly happy for me to handle the babies as much as i liked.
you could give mum an additional water bottle with 1/2 unsweetened cranberry or baby apple juice 1/2 water - this will help with milk production and can help prevent mastitis.
you could also give her a spoon of oats mixed with a spoon of wheatgerm twice a week to give her a bit of a boost. i think her diet is already great so well done.
it might be a good idea to have the male checked out at the vets, it could have been a different male as she was already pregnant when you got her, they also may have put the male in with the girl too soon after neutering and he was still fertile.
enjoy the babies