I very much doubt the Synthroid will be too much as you are very Hypo and it will take a while to get the TSH down.
You will know if you are on too much synthroid as you will get HYPER symptoms...very fast heartrate, excessive sweating, excessive bowel motions, anxiety, intolerance to heat etc.
Just take each day as it comes and cross that bridge when and if you come to it.
I am surprised your TSH was so high with being on Armour.
Log your daily symptoms and if you feel no change in them after 4 weeks, call your Doc as you may need a hugher dose of Synthroid.
All the best.