Hi bravopapa
I was diagnosed LADA 13months ago, with similarish BG levels that you currently have. My diabetes consultant advised me to stop taking the Gliclazide as he said it can do more damage than good (squeezes the insulin making beta cells till there is nothing left, I think we're his words). He said I could continue with the metformin if I wanted, as it would do no harm, but that in his opinion it would not help either..... So I stopped both.
With my high levels of GAD he said I would be on insulin within weeks, maybe a month..... That was 13 months ago. My BG levels are much lower now than then....... But this is down to my diet, and eating to my meter.
Lots of folk on this forum have found the low carb high fat diet to be very effective at keeping blood sugars low. I did not set out to go LCHF, but started to eat to my meter, and found within a couple of months I was LCHF, and I have been that way ever since.
Dr Bernstein's diabetic solution is a good read. I have been following his 'solution now for 6 months. It works for me. He believes (as many other also believe, but many don't) that insulin making beta cells destruct when BG levels rise above around 7.5mmol. His solution is to keep fasting BG levels at 4.6 and 5.6 2hr after meals. I have not been able to get to his 4.6 levels, averaging around 5.0 over the last 6 months and I have not see any deterioration in my insulin making abilities during this time. Dr B says that if you can keep to his 'normalized' BG levels the honeymoon period that we are both in can last many years......so far it is working for me.... Maybe worth looking into to see if it might work for you, but if you are going to give it a go, you need to do it pretty quick, as possibly your beta cells are gradually destructing now, and once gone, they are gone.
You can download his book on kindle for around £5.00. Dr B is a T1 diabetic, with his own diabetes practice in USA with hundreds, maybe thousands of patients. Diagnosed at 12, now 80, with no diabeetes complications.... He also does not recommend Gliclazide, but does Metformin.