BMI truly is not an exact science. It really varies on you as a person, your bone density and weight, muscles you may have, water retention issues (which I do all the time!) and other factors - such as the way the fat which you do have (naturally we should ALL have some) sits on your frame. Some people do look their best at the higher BMI's (23-25), some at the very lowest... It's knowing what's best for YOU. My dad always says I look better when I have a little more weight because I have a very round face and a fairly short European blocky frame. My rib-cage is really wide compared to many women out there, even when I was BMI 18 I was still a 36A-B, no matter what!
FF - the gut will never go away because you have set your visual focus point on that area. No matter how small it gets it will ALWAYS appear huge to you because a) psychologically, by focusing on it the most it seems bigger and is not seen within the context of the rest of the body and b) you are mostly looking DOWN at it. ... If you constantly look down upon it the change daily is so small that it will appear exactly the same to you now as it did at the beginning of LL. If you didn't see it for a good few months - I think you'd see the difference!
My boyfriend did LL with me in January 2008 - October 2008 and was at 54stone. He got down to 12stone I believe (which was way too skinny for him) and has since maintained at 15st for the last nearly two years. The good news is that moobs do go away. The bad - if you've been unfortunate enough for your stomach muscles to collapse under the weight and develop quite a large 'overhang' - it will never go away without a lot of toning and exercise (which my bf doesn't do!). It's been his sore point for a long time. The good news is I love him no matter what, I adore his wobbly bits (though I don't tell him because I don't want to ruin his self-esteem). Hell, we loved each other when BOTH our BMI's were 44, and we loved each other when we were hungry and grumpy on LL for months on end so ... if that's not true love, don't know what is!
Either way, I went off on a ramble because I don't want to do this dissertation reading.. haha.