Just got the Incipio Offgrid. Has anyone been having any trouble getting the bumper to fit flush on battery part? It takes a bit of work to get it to sit flush on the one I received. Sometimes you have to push the bumper in and even then it takes a bit of effort. Instructions say to start from top to bottom which I've tried but it's not easy. I may return it. I wonder if the Mophie uses the bumper type design? Does anyone know? Can't tell on their website. Thanks.