You are doing just the right thing, so put your mind at ease. The only "advantage" to a layer ration is the extra calcium it contains - the extra calcium is only needed by a bird who is actively shelling and laying eggs (the laying process takes calcium as the muscles involved need calcium for proper contraction). Any female bird not producing eggs - too young, too old, molting, winter lay off, etc - does not need and can actually suffer the same damage from excess calcium as any other bird (male, chick, etc). Many chicken keepers, myself included, feed a grower ration from hatch to death and simply provide the extra calcium laying birds need by providing free choice supplement such as oyster shell that each laying bird can take in as needed. This is so much easier when keeping a mixed flock and the extra protein in the grower ration is my preference over the lower protein content of layer rations.