I have a white 4S and a newer Otterbox Defender version. I need to rock the Defender during the week because of my work environment. But on weekends I like to switch out on a less protective case. What I'm looking for since I like to switch out on weeekends is a front and back screen protector I can use with the Defender. I tried Zagg front and back and it doesn't work with the Defender. It's a very tight fit. When I first got my white 4S the factory plastic that comes out of the box fit very well with the Defender. Any help?