I agree with Bargoo. I don't think the body settles at the correct weight. I think we need to WORK at gettting our weight to where we're comfortable with it and then continue to work to keep it there. Providing of course that it IS indeed a realistic number, one in that we CAN keep up with.
Exercise and the shape of your body will help to determine that as well. Also body fat% is a factor. You may very well be at a "comfortable" weight that doesn't mesh at all with "those" charts.
I think as you get closer to your goal, you can better determine what that weight should be. There's really no way to know until you are there. It's not a number written in stone and can be changed back and forth many times. Try not to worry what your "final" number will be. Don't forget it's next to impossible to stay the same weight day after day, week after week. There will be variations. You might not find a final number, but a "range" that you are most comfortable with, say within 5 lbs.
You are doing PHENOMENALLY well. Keep at it. I have no doubt when you get to that size or that number or that feeling, you'll know it. I wish you continued success.