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Advice drop the crack corn ,feed only layer, and if sure of age you will have eggs within two week.
Birds would rather eat grain(crack corn) than man made pellet of layer....but the layer is all they need.
corn doesn't feeding much crack corn will cut down on eggs. Seen it many time ,yep lot cheaper price ,but less egg production.
Did you feed them crack corn as a grower, that may be reason they look young...slow growth with corn in place of grower.