That result of 91 is not all that high. It is an indication of Hashi's, so you will know what to expect going forward: gradual destruction of your thyorid gland with diminishing output of natural thyroid hormone thus requiring increasing doses of thyroid med adequate to relieve hypo symptoms.
Of much greater importance are symptoms and also levels of the biologically active thyroid hormones, Free T4 and Free T3, which re not the same as Total T4 and Total T3. If you have been tested for those, please post results and reference ranges shown on the lab report. Also, please tell us about any symptoms you are having presently. Also, what is your daily dosage of the Synthroid and Cytomel?