I've been about the same weight for about 20 years. My wife on the other hand yo-yos up and down. Even if I'm 20 lb more than the experts say I should be, I'm quite healthy and stable.
Once your body finds a set point that it likes - your going to be miserable trying to reset it. Your hormones and emotions will fight you the whole way - then once you loose the weight, in 6 months most, all, or even more lbs. will be back. That's really the definition of yo-yo dieting - it's very unhealthy.