I started breeding 1.2 when I had three bps and froze the extra babies I didn't need. It never got out of hand. You just have to pay attention to what you are doing and only breed as needed. You can always power feed (every 4 days) if you get too many. That's what I do now when I have a few litters pop up at the same time. I just power feed when the rats are small then feed a regular schedule once they get close the right size. I've got 9 bps and usually about 50 rats (including pinkies) at any given time. I've never had a surplus of rats yet. I have 12 breeders currently.
I also started breeding because of the money going into FT. I was spending $20 a week on FT and now I'm spending $20 a month to care for the rats.