I’m no expert but am I right in saying that I have lots more room to increase ?
Absolutely.
The aim of a treated Hypo patient on Levo only, generally, is for TSH to be 1 or below with FT4 and FT3 in the upper part of it's range, if that is where you feel well.
I think my T4 was only 15% through range last time , have I improved a bit ?
No you haven't.
This time your FT4 is 12% through range. So no improvement but the difference is minimal so you've more or less stayed the same.
I think the most obvious thing to do is increase your dose to 50mcg, retest 8 weeks later to see what that achieves.
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