Went to Endocrinology Clinic today. The outcome's a mixed bag.
On the plus side: saw head honcho, who prescribed T3 on the basis that I was feeling much better on my self-administered dose. She also said that my ferritin was still too low at 102.5 pmol/l and that she thoroughly approved of the new, lower TSH cutoff limits for diagnosing hypothyroidism in the US.
On the minus side: wants to decrease my T3 dose from 6.25mcg to 5mcg per day so that my TSH rises back into the 'detectable' range. Osteoporosis, atrial fibrillation, etc.
So I'll comply for 6 weeks on the slightly reduced dose and see how I feel. If it keeps head honcho happy and I don't feel much difference then I guess that's a win. If I feel lousy then there could be interesting times ahead...