Very useful personal data. I have been thinking about what could make a vial seem weak, and this is a good reminder that sometimes someone simply responds later, and without trying different sources you would not notice that.
It seems like in most GLPRA discussions people strongly advise keeping doses as low as possible and starting well below the clinical trial starting amounts. That advice may come mostly from lean bodybuilder types. For the overweight, obese, or type 2 diabetes users the drug was made for, I would suggest ignoring most of that unless you turn out to be a super responder. I agree that if you are already getting good results you do not need to raise the dose on a fixed schedule, but being overly cautious about going up, as long as side effects are manageable, probably will not help the people the medication was intended for when the doses stay within trial guidelines. If you are obese and happen to lose everything you wanted at a low dose, I am genuinely happy for you.