I agree with the above--just because the labs might say you are within the normal reference range does not necessarily mean that it is perfect for you. A few weeks ago I was told that my labs were within the normal range but I still had slight hand tremors and a rare short spurt heart pounding on the day the labs were drawn. A week later I felt better.
Not sure what you're considering optimal. Optimal is what's right for YOU, not just a set of numbers that your results should fall between.
As gimel requested, please post your current lab results, along with reference ranges, which vary from lab to lab, so must come from your own report.
Please post those lab results that are considered as optimal, along with reference ranges shown on the lab report, so that members can comment.