Whatever you feel best at.
The range is wide, but you are at
the hypo side now. Could you feel
the difference in
the past?
The longer you've had this the more you can tell the difference. Ask for copies of the bloodwork from now on to make notes on.
Also, do you get free T4 and free T4 tested (need these), the actual thyroid hormones?
TSH is a messenger hormone from the pituitary telling the thyroid what to do, not the best to adjust meds by.