The TSH seems quite low on 3 of the 5 tests listed, but reasonable in 3/07 and 8/06 -- if you are taking generic then it is possible that the some of the refills are from a different manufacturer (ie sandoz vs mylan, etc) resulting in a different outcome. Based on the most recent TSH, the dose should be lowered -- talk to your doc about the precise dosing, but would consider 0.137mg and ensure consistency with a branded levothyroxine product.