If you took the cytomel 2 hours prior to the blood draw, your FT3 would be a false high...
Cytomel enters the blood stream very quickly
and increases FT3 level, but it peaks within 2-4 hrs
and is gone a few hours later. That's why it's recommended that the total daily dosage be split into 2 doses to keep FT3 levels more stable over the course of the day. So in answer to your question, yes, it could easily have made that big a difference in your results.