I’m leery of lower protein feeds. I accidentally bought 16% and my girls were eating feathers.
One time when some family crises prevented us from getting to the farm store we bought a bag of cheap layer at Wal-Mart.
I was going through 50# in a week but it only lasted 5 days. I think they ate more to make up for what they weren't getting.
Yes, my crumble was very disappointing, it was 30% dust that they would not eat and wasted alot of feed. The pellets are wonderful!
If you have a feeder with a deep pan and an inward-rolled lip they can't toss the unwanted feed away like they do with a shallow pan with a flat lip.
Then, when you get to the end of the bag and have accumulated a bunch of dust in the bottom of the deep pan you can make wet mash so nothing is wasted.
My birds think wet mash is a treat.