What are your actual, current, thyroid levels? Please include reference ranges, since those vary lab to lab and have to come from your own report.
There are 2 ways to calculate the dosage of desiccated vs synthetic. Dessicated has 38 mcg T4 and 9 mcg T3 per grain, so if you'd raised your desiccated according that, ahmee's calculation would be correct, and would seem logical; however, according to the conversion charts, 1.