Dave,

Keep testing even after you level off. After I dropped 20 pounds late 2012 I severed ties with my gp who was unresponsive to my then newish and growing neuropathy issue. I didn't rush to fill my metformin, instead cutting my dose to once daily until off for a few months.

I kept monitoring and right before I found a new gp I found wild swings taking place. I went back on metformin and have been on since. I may reconsider again, as I am further down in weight exponentially and even better a1c wise, but I thought it was a useful anecdote.