How bad is it to overdose on thyroid?

[Logosoverid]

So I'm new to peating and recently I got my hands on tyronene (T3) and tyromix (T3/T4 mix).

I had been using T3 for about 2 weeks, increasing the dose from 8 mcg to 16mcg, but I didn't really feel any difference from using it.

I switched to T3/T4 and was taking 1 grain for a couple of days, but got impatient from again not seeing any difference. So I upped the dose to 2 grains and yet again, no difference.

I know the full effect of taking T3/T4 can't be known until 2 weeks after starting the regimen due to the longer half life of T4, but how dangerous would it be to take an experimental dose of 3 grains at one time? Am I playing with fire? Should I go back to taking 1 grain and complete the entire 2 week course and assess from there?