I believe there is some work going on into an algorithm to assist with insulin dosing for t2s. It might be worth asking after this with your diabetic team. Alternatively you could look at the uk clinical trials site to see if there are any associated with it.
There is a rough dosing calculator on the Lantus website.
Unlikely that there will be an algorithm that takes into account your personal level of insulin resistance and how well metformin works on your liver.
I've just finished 5 weeks of Lantus (@80 units a day) that didn't bring my sugars to single digits, (along with metformin, gliclazide and sitagliptan).
In the same 5 weeks I put on 10kg, mainly around the belly and it is so taught from bloating you'd swear I was pregnant!
Just saying, the Lantus website suggested 23 units as my max dose, but even 80 units wasn't enough, and at that level of Lantus, the lbs piled on!
In one of the first diabetes management books I read, the first chapter explained how as diabetics, we have to become our own doctors.Oh dearhave you had a c-peptide test done recently at all? Maybe you don't produce hardly any insulin anymore. I am in that boat. So they have me on both lantus for the basal and apidra for bolus with meals. Since I've been on insulin I've had better sugar numbers that's for sure. The oral meds were doing nothing for me, which is no surprise as they only work when you have your own insulin. I would think that if I was on only basal insulin it wouldn't help me too much either because I don't have my own insulin to tackle the peak you get with meals. Maybe you also need bolus insulin?