You could always resize the images that make up the manga. ImageMagick is easy to use (and free) to batch process. Actually isn't this what mangle does as part of its conversion process (ie when you select the device it will resize each image to fit the screen resolution and bitdepth)? I think the K3 though still pads some borders with its normal margin (I think top/bottom get more margin too). Anyway, zip up the images, rename *.zip to *.cbz and Calibre can convert that to a mobi if you want. I'm not sure what the exact ideal pixel dimensions are for the images so that the kindle doesn't do any scaling, but it will change with how you've set up your device margin settings. I've never used the file browser in my K3 so I don't know if the margin settings effect that or not.
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