Hello mrjp,
Like you I was not overweight at diagnosis ( prediabetic) took on board all the advice about low carb, high fat and lost over two stone in a year.
Few months ago read somewhere that naturally slim people don't store or use fat efficiently, so for them the answer to weight loss is to increase both fat and protein. Since increasing protein intake my weight loss has almost stopped. Currently one week up and another down. So getting there.
You have done well with BG control, weight control will happen as well.