I think you should keep it simple to try and get back on track. When on NDT the only accurate figure is the FT3 which will be high but must not go over the range, the FT4 can, not will, drop to around half way and the TSH will be suppressed and can even be zero. Reasoning is that it is safe to be that high in the FT3 range and that's what some of us have tried to do on Levo but for various reasons haven't made it.
So we are now in the correct part of the range of the T3 that out body needs. So now our body knows we have enough T3 to be well on so it doesn't need a huge store of T4 because it doesn't take much to convert to the T3 that we are already happy with. And wcause our body is getting enough T3 then the pituitary doesn't need to seen a message to the thyroid to produce more medication so TSH is on the floor
Now when you first started on NDT you were probably told to start low to get your body used to the T3 but also if you were switching from Levo you would have enough in your body of T4 to convert to T3 to make up the shortfall so that as you slowly increased your NDT the store of T4 would be decreasing so you short t suddenly feel a dip. Ok may not be spot on but close enough to make the change over relatively smooth.
You will Aldi have read that to increase up to 2 grains a day and then increase i quarters as you could be very near your optimum dose. But if you are found to have an adrenal problem you may not be able to raise your dose any further and you have managed that do at the moment it looks as though you are just over medicated.
When I started I got up to 3 grains and felt good or rather I did for a while but then I was beginning to feel over stimulated. But my bloods were due do I did t decrease but got a reading. And guess I was over the range. My Endo said to drop down to 1.75 which I felt would be far too much but I slowly started to reduce my dose and yes he was correct! I felt wonderful on 1.75! I hated to admit it but being over feels very much the same as being under!
what dose of Levo have you been on before? I alternated 100/125 mcg. I was feeling good on that but started with allergies so had to stop it.