it's just not possible to lose the same amount of weight by eating more - the calorie deficit just isn't as big.
If you are still SS'ing now, it is very very possible you are burning muscle and not fat some of the time - so although you are losing weight this will not all be from fat. Better to have a slower loss and actually losing weight safely - i.e. not burning muscle tissue!!
Get yourself onto 790 then 1000 cals you!!! bad CDC should have sorted this with you already!