The readings are not terrible on diagnosis, by way of contrast I was circa 16 fasting when first diagnosed. On a middle of the road observation it looks like relatively minor changes would see your numbers drop. The diet doctor I think is an excellent resource as it has pictures of what to eat and what not too, if you can either do or approach the low carb high fat diet, you will must likely see an improvement; I have noticed a difference in blood glucose and weight since dropping more of the slow release carbs I intake. As ever if you can fit in some regular exercise and plenty of sleep, this will help.
January 2015 HbA1c 134, 98 kg
March 2015 HbA1c 59 (2 x 500g Metformin), exercise and diet
Dec 2015 HbA1c 41 (2 x 500g Metformin), exercise and diet, 92 kg
March 2016 HbA1c 42 (1 x 500g Metformin), exercise and diet, 92 kg
June 2016 HbA1c 42 (1 x 500g Metformin), exercise and diet, 92 kg