I don't see Actos in your list in your signature. I don't see how that could cause your leg puffiness if you aren't taking it.
MY own MD doesn't seem to think much of my slightly swollen lower legs and ankles. I think maybe he has seen so many grotesquely swollen limbs that he doesn't think it signals much problem at all. I have never been able to figure it out, though. Can't relate it to my meds and can't relate it to my diet. Can't relate it to my activity or inactivity. Can't relate it to menstrual cycle or perimenopause. ???? It does come and go. Right now it has been gone for a month and a half.
I think going from a BG of 450 to 196 in 6 days just by low carb eating is fantastic! I don't think you will find the metformin gives nearly as much improvement as the low-carbing does, but I wish you luck, so that it might get your BGs the rest of the way down! I do credit metformin for my good morning BGs (along with low-carbing of course!) My morning goal is 85-95 --eh, 4.7-5.3-- and that is from someone 16 years diabetic and first diagnosed with an A1c of 13.2. I do take a large amount of metformin, though.
Good luck; be patient; and know that if one approach does not work well enough, you can always add another or switch to another.