Both your free T4 and T3 are a wee bit on the low side, I would have them checked again in a month or two.
There is a huge amount of debate as which is the best measure of thyroid function, and most say the TSH is the most accurate measure, however in a much narrower range than a lot of labs cite, and yours is in that range.
When you were dieting were you dieting with low carbs?
Are you dieting with low carbs and/or low calories now?
Are you experiencing any symptoms?
If you are, it is possible to find a doctor who will treat you on both the low end of normal free T4 and T3 and the symptoms, however, you do have to remember that once you start, if you do think that you may not need thyroid med anymore, your thyroid will be suppressed (but it will recover).
When thyroxine is used as hormone replacement, it does mean that you will need several blood tests to get the levels right, the cost of the prescription, yearly or twice yearly blood tests as well as risks associated with taking too much thyroxine over a long period of time if your lower end of normal levels are just temporary.
Thyroxine overdose:
Anxiety
Confusion or disorientation
Feelings of a rapidly or forcefully beating heart (known as heart palpitations)
An irregular heart rhythm (arrhythmia)
High blood pressure (hypertension)
A rapid heart rate (tachycardia)
Seizures
Strokes
Coma
Death.