Try setting "Aspect Ratio" to "Force 4:3" and "Dol Video Patch" to "All". If that doesn't work, set "Video Width" to "Framebuffer". If that doesn't work, go to "Features" in the global settings menu and set "Wii U Widescreen" to "Off". I don't have a Wii U myself, so I can't test it out, but I'm...