Inconsistent results

In October 2015 I was taking 37.5/25 (i.e. levothyroxine/liothyronine). Results were TSH: 0.24; FT4 7.33; FT3 5.0. For some forgotten reason I moved away from that dose to 75/25 in October 2016. Then the results were TSH: 0.02; FT4 12.9; FT3 4.0. Ranges TSH [0.27-4.2]; FT4 [12-22]; FT3 [3.1-6.8]

Does change in results make sense? So lower levo (37.5) leads to higher FT3 (5.0) compared with 75T4 and FT3 of 4.0.

I am going demented trying to get the right combo of meds, results and symptoms.

Can anyone shed light on these apparent inconsistencies? I can think of a couple of possible culprits but don't want to put ideas in anyone's head!

Many thanks.