Re: Going to remove thyroid.
Armour (in the US) is natural desiccated thyroid gland from pigs and you'll find that a lot of people who don't fare well on synthroid do much better on it. There is a good deal of information on it (and other topics) in the Information Archive.
If the synthroid is working for you so well it might be best to leave as is, you know? Getting everything just right can take a lot of tinkering and can be frustrating, especially if you've got it working well right now.
A foolish consistency is the hobgoblin of little minds.