Three way scratch is not an everyday main diet. It's for treats, for training them to come home to the shaking of the can, etc, but it is not made for their daily main diet. They need layer feed, which is about 16% protein, whereas your 3 grain scratch is only about 8% protein, not enough nutrition if you expect eggs from them.
You need to tell the feed store what you want and do not let them tell you. Nine times out of ten, they'll lead you astray to the detriment of your hens.
You need to tell the feed store what you want and do not let them tell you. Nine times out of ten, they'll lead you astray to the detriment of your hens.