Hi
I would initially persevere with the Met, as you can ramp it up to max dosage before deciding if its not working. Im not sure where the figures come from re lowering of bg by 1 to 1.5 comes from.My MIL is T2 and Met is much more effective than that for her. However, she is on MAX daily dose
Also, there are other meds for T2s who dont do well with Metformin alone - too many to mention and Im not an expert so best to google or wait for other T2's to help, so insulin not necessarily needed just now (ie gliclazide)
What I would say re anything I've read about 1.5/LADA is that many people start on oral meds (because diet alone doesnt seem to work) and then need to progress to insulin (as the pancreas slowly gives up, more slowly than T1 but assumed to still be autoimmune in origin) but your OH hasnt needed ANY meds until around 3 year point.
Again, not an expert but I shouldnt think this would point to LADA/1.5?
However, as always, I stand to be corrected