I'm seeing a problem, with the covers, the spine needs to be 58 pixels, or it goes over the front and back slightly. Or are you making them for if the coverflow dimensions get set differently?
I have backup sets that are all the proper aspect ratio. There's currently no way to compensate for different sized spines, so this is as good as its gonna get until the devs make some changes. For Example, the n64 covs (sized to a height of 680 pixels) are actually 1090 pixels wide, Genesis would be 1061 wide, etc.. and they have different sized spines. So even your "58 pixels" technically is off too, because these covers had to be "shrunk" to 1024 pixel width for wiiflow to display the image. If changes are made to the 'flo, adjustements will be made here as well.