The uptake test tells you how much T4 is being taken up and converted. That is all it does not tell you if it is converted to T3 or reverse T3. It is used to determine if you may have a conversion issue.
FTI is free thyroxine index. It is an inaccurate indirect measure of your T4. The calculate it based on other blood indicators. It is a waste of blood, money, and time in my opinion as a chemist and patient.
Your T4 has a 20% error.
You really needed a Free T3&4. It is a sad dag when I say that your TSH is the best indicator of how you are out of those tests...
Your symptoms back up the TSH. Backing off to 50 mcgs is fine you need a FT3&4 run though to determine if you are balanced in levels.
The liver enzymes can be a result of a mild hyperT state combined with mild dehydration. This is a thought from my ATD treating RN Graves suffering aunt. If she has a flare it stresses her liver. Added sweating and other hyperT issues aide in dehydration as well. In 1-2 weeks your hyperT levels should lower and your symptoms improve.
I would be sure to drink a lot of water to help counter act things in the mean time.
Good luck! I wish I had more advice for you!