, for a TSH
of 10 , would be based on the presence of a strong Clinical suspicion. I think you have got the 3rd increased dose wrong , which might be 100 mcg or ( 0.1 mg) . Keeing the TSH in the normal range, especially if Free T3 & Free T4 are also normal, would be the best parameters, if the Clinical symtoms support them, to fix the correct dose. Weight alone is a poor guide , as several factors & inaccurate scales/ different times of the day & clothes worn can show different readings.