Ok, I really don’t know you or your circumstances and I don’t know how much training and dieting experience you have, but I’d like to bring out just a couple points to think about.
First, you may have unreasonable expectations, newbie gains allow you to readily gain/preserve muscle while losing fat, but that dream time does not last very long.
Second, if you don’t really know your caloric requirements and you restrict yourself too much you can mess up your progress and stall your progress. I might figure your BMR to be perhaps 1500 calories, and if you are active like you say you are, then you may need more than 2500 calories a day to sustain yourself. Taking in 1600 may just be too much of a calorie restriction.
Third, most of the transformations I have seen have focused mostly on cutting, trying to lose body fat. Is your nutrition and exercise focused on cutting? Or are you trying to gain muscle and cut? Once you are past being a newbie, you can’t really have your cake and eat it too.
And take all my comments strictly at face value, none of my abs are showing so I am really one to talk.