I run my colonies at 1.4. Once they are set up I never change them. I leave the male in with the females and never take him out. If all four females have litters at about the same time it gets too crowded when they are weanling size so I will take a lot of the babies at a smaller size.
I monitor the production of each colony and when production drops off I replace the whole colony with a younger one. They usually last 6 to 8 months. I feel like personality traits are inherited so if I have a colony that is nervous or tries to escape or kills babies of just pisses me off, I never take future breeders from that group.
The tubs are held tight against a screen top. I have a drip water system to each tub. There is a food hopper across the back on top of each one as well.
Hope that helps, here is a picture of one of my racks.
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