Your ferritin looks ok now but your iron serum and percent sat look lowish. ZRT is good. I used them back in the day and the price is nearly the same. Before you increase any thyroid meds I would get that 4 x diurnal saliva tests done if you can do it. If your cortisol is low it would explain a lot of your symptoms and your RT3 problem.
Do you know if my cortisol is low or high if Defy handles that and with meds?