Hi Barb,
It's pretty typical to have thyroid antibody levels similar to yours even years after RAI. Your thyroglobulin antibodies are low compared to what's seen in Hashimoto's and since you have little if any thyroid tissue you shouldn't notice an effect. TPO antibodies indicate thyroid inflammation. Your TSH receptor antibodies (TBI and TSI) may never get much lower but they shouldn't cause acropachy, PTM, or TED unless they rise higher.
The glandular product is fine. Some people react to replacement hormone, both synthetic and glandular, or to the fillers in it. If your hypothyroidism is well managed, I wouldn't change anything. best, elaine