Badger,that is just awful
I have been feeding mine a can of Fancy Feast ever now and then,but mostly Wellness.
Mine did not like Orijen dry,they don't eat much dry food period.
But I don't feed 12 cats like you do..
I remember yrs ago,we bought some Kentucky fried chicken and inside the breading on one piece there were dead maggots,I have never had KFC since
I think your idea of feeding Orijen is ok,especially with 12 kitties..