Nice going...
My only advice is:
Dog food is crap.... 27% protein is way too high for rats. I know you are supplementing with other stuff, but that's just way too much protein for rats. Eventually, your stock will start having health issues, starting with skin irritations, and then kidney problems. The babies started on such a high protein diet will be the first to start with the issues.
The highest it should be is 19-20%.
Don't take it the wrong way. Just trying to help, been breeding rodents for over 20 years...