It is very unlikely that 75 mg of Armour would be an adequate dose. I say that because serum thyroid levels are the sum of both natural thyroid hormone and thyroid med. As medication doses are increased the production of both TSH and natural thyroid hormone is diminished. Only when TSH is suppressed enough to no longer stimulate natural thyroid hormone production, will serum thyroid levels reflect further increases in thyroid medication.
A good thyroid doctor will treat a hypothyroid patient clinically (for symptoms), by testing and adjusting Free T4 and Free T3 as needed to relieve symptoms. Symptom relief should be all important, not just test results, and especially not TSH results. Members here say that Free T4 needs to be at least at the middle of its range, and Free T3 needs to be in the upper half of its range, and then adjusted as needed to relieve symptoms.
Clearly you have a number of hypo symptoms and need to get your Armour dosage increased. In addition, hypo patients are frequently deficient in Vitamin D, B12 and ferritin, so you need to test those and supplement as needed to optimize. D should be at least 50, B12 in the upper end of its range, and ferritin should be at least 70, and some sources say 100.