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Stupid question: are you just doubling every pixel of a non-retina source for the @2x images? Does that really provide any extra clarity on a Retina display (beyond setting the proper size of the image?) Or are you actually starting with an @2x image and halving it for non-2x default?

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The retina modifier is only useful when you request a smaller thumbnail than the original.

So your original may be 1000x1000px, you use a 128x128 thumbnail on your regular (non-retina) site, and you serve 256x256 thumbnail to your retina users.

If your original image is small then there is nothing to do.

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