Thyroid meds are bodyweight dependent...
Most people don't carry as much LBM as you do...
Body weight appears to be the main levothyroxine dose adjustment variable
https://www.thyroid.org/patient-thyr...issue-6-p-5-6/
Now the article says bodyweight but I highly doubt fat requires thyroid hormones so my guess is that LBM is a better indicator than bodyweight.
If fat mattered then every 300+ lb fatso with hypothyroidism would require large doses and they would make bigger pills.
Also:
You have zero thyroid so you produce no hormone whatsoever...
Most people with hypothyroidism produce some hormone just not enough.
I am 222lbs with a somewhat functioning thyroid and I take 175mcg.
As far as HGH goes... I am clueless.