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If you have troubles like these because of CA, then make sure it's the green channel that is in perfect focus, rather than the red or blue.
The reason for this is that a single pixel on your typical OSC or DSLR is recorded by two green sub-pixels and only one blue and one red sub-pixel.
Debayering and using only the red channel is throwing away 75% of your data, whereas debayering and using only the green channel is only throwing away 50% of your data.
Additionally, you could decide to use your green channel as a luminance channel and recomposite your image. This way your image is sharp and it's still in color (though brightness in some areas may be slightly off due to the missing brightness contribution of the red and blue channels).
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