To be honest,
@TerryinDorset , if you are tolerating the Metformin well, I'd consider sticking with it until you have achieved your targets, as it is known to aid insulin resistance and weight loss (and this said by someone evangelically anti-meds!).
Looking at your stats, you've made great progress but some of your levels are still at what could be considered the riskier end of things. Your BMI (for what it's worth) is still a little up on where you want to be and visceral fat along with that.
When doing my own research into visceral fat I found it very hard to find anything quantifying the scales quoted in various places. About the only thing I found, talking in numbers ( as opposed to "less is better") suggested 1-12 is acceptable, and above that higher risk.
I don't actually know where I started on that front as it was 4 months in before I weighed myself, post diagnosis (long story, I won't bore you with), never mind measured anything else, and I haven't recorded that VF starting point, but I think it was 5. I'm now at 3 and have been for a loooong time, although my body fat and muscle percentages have moved on.
Your doing really well, but in your shoes, I might want to build myself a margin of "comfort" into my target, but we all set our risk dials to our own comfort zones.
Really, really well done again.
If I recall, you are an HCP, or retired HCP yourself? On that basis, have you had much peer or professional interest in your progress?