I believe your goal weight should be a personal decision. It really depends on how you feel, still have energy, don't look sickly. Your doctor may have been setting a high goal weight to see how you would do along the way, then he could change it later.
I think my doctor is a little upset with me because I haven't reached mine but I am happy the way my weight loss is going - not too fast. I'm okay with it even if he is not. It is my life and I paid for my band, he didn't.