Hi Emily, you WILL get into the 170's. I'm sure it must just be a matter of your metabolism readjusting, or fat being converted into muscle.
It's amazing how many inches you lost, I would continue to look at the positive side of how well you are doing.
I saw a man on the news last night, who claimed he lost 100 pounds by eating more peanut butter in his diet. He went from about 310 pounds down to under 200 pounds. I guess the idea is peanut butter is quite filling. Something about you still don't eat more than 6 or 7 tablespoons a day, but it fills you up better than some other foods.
I guess different things work for different people.
Keep up the great work. I bet things will get better for you when the weather improves, and we all get more active.