Based on bloods and advice from learned thyroid folk here I decided to go from former dose (75/100 t4 + 10 t3) to 50 t4 + 15 t3.
As usual, any dose over 10 t3 gives me a little trouble, so I split the dose. Tried levo + 10 t3 at night then 5 t3 in morning. Feeling a bit racy/tightly wound after I take that extra 5 t3. Maybe it's my imagination though because my dose certainly shouldn't be any higher in real terms, if anything I've dropped the levo a bit more than necessary, yes? My new phone doesn't seem to have a timer on it so I'm neglecting to take my pulse like I used to but just now it was 78 at rest.
Tried splitting t3 dose in three but that's for the birds, got symptom breakthrough (mainly swelling).
I'm a guest here (away from home) so on my best behaviour and don't want to feel bolshy on too much t3 but when I get home I can experiment a little more.
Good news is I get extended periods where I'm not aware of my heartbeat at all, it's like it disappears, no pounding or racing or thumping or missed beats. That seems good to me.
Still necking my supplements: 40 gentle iron + 1000 vit c, 5000 vit d, folate (have run out now so waiting for new bottle) and self-injecting b12.
Glad for the support I get here. Thanks!