I had to lose 10% of my weight before they'd consider me for the surgery, so I'm sure you'll be fine. And if in doubt - ASK! Also, I don't know about you, but the first couple months of any diet I've ever done were easy compared to later - so really - you should be so lucky as to lose too much.
My guess is, if your ins. company requires the 6 month thing, but not your surgeon, he'll do the surgery even if you lose more weight. I would be really suprised if they turned you away because you were too successful!
