Redid my math as I forgot the dux and since you have mostly dual purpose and novelty breeds that are know to be productive, they likely even eat more than the average 4 ozs.
I reached 15.5 lbs like Cindy, which is 3.5 sacks of feed in an 11 day period
What type of feeders do you have? Do...
You should be going through 13-15lbs of feed a day with that lot, you should be only be going through 3, 50lb sacks.
What type of feed? Protein content? What breeds? Some eat more or less than others.