Why don't you try adding calories in 100 kcal daily increments? So, next week you eat 2100 kcals/day; the week after 2200 kcals/day, and so on. Then, weigh yourself at the end of each week, or better yet, get your bodyfat checked at the end of each week and see how your body is reacting. If you do it gradually, you should be able to figure out the point when you're starting to store too much body fat.