I found that the last couple of stones took ages to lose, but when I got to a weight that I was happy with I started to bring in more higher calorie foods. I have now set my maintenance weight level within a half stone bracket and if I go to the top of it (which I only ever have once), I will cut down on the 'treats' and if I approach the lower end I will add a little more in.
My dietician advised me last week to possibly go more for treats like crisps rather than high sugar content foods.
I am two years out and at the moment not finding it too bad maintaining. I also think that as we move further away from our surgery dates we do have to work a bit harder to lose the weight, at least I did - so this in itself seems to give a natural stop.