I used to house them as you described, and did it for a few years, but babies do get hurt due to the females fighting over them (they steal the babies from one nest to put them in theirs to care for them), it does translate in losses since at the beginning the babies skin is very fragile.

I have found that having 1 male per tub and rotating females, pulling out the pregnant ones each week and have them birth and nurse individually for the first 5 to 7 days works best for me (I try to breed for maximum production, producing a few thousand feeders each year). After the first week of life the babies and mothers are placed in group of 3 for communal housing/nursing until it's time for the babies to be weaned or fed off (which ever comes)

I do however still keep 3 tubs where 1 male rotates between the tubs.

If you chose to rotate the females here is what I used to do.




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