Since layer is already minimal in it's nutritional quality (being designed for the needs of commercial caged layers for their single-season laying life), adding this other stuff to it is almost certainly detrimental to the flock's health and contributing to laying problems.
@U_Stormcrow has a spreadsheet with the nutritional information for various feed ingredients to help people who home mix feed.
You would probably do best to immediately put your flock onto a 20% all-flock with oystershell on the side and NO TREATS.