He is doing very well, but it's hard, I know, I have done it.
Some while back my Diabetic Specialist Nurse offered me Metformin, my BGs were then and are now, good, at around 5% Hba1c.I resisted at first but after a while I was convinced enough to give it a try. I had no side effects and it (Metformin) has allowed me a little more flexibility with my diet. So don't rule it out, it is a good drug if you tolerate it well, and as a bonus I can eat the odd treat with it affecting my Bgs to much. It is also reported to offer some protection to the heart, liver etc.
A reading of 7mmol two hours after food is good, up to 8mmol is acceptable but the lower the better of course.
My insurance (car, travel, etc.,) simply ignored the Metformin when I told them. They seemed to be happy that I am on treatment and that there are no complications.
Tell him to keep up the good work, and maybe give Metformin a try, it also helps with weight loss by supressing the appetite somewhat.
H