Did you use the WRX springs as well or only the struts? WRX's are lighter in the rear than our BD's so it is likely that you're getting what everyone refers to as "saggy butt." I have the same deal going on with my BK wagon 'cause I'm using BD springs. Gonna swap those out this weekend to the proper springs (hopefully) though. There are companies out there that make top hat spacers to remedy the saggy butt issue if you're interested. Apparently they work really well.