CA correction in ACR/LR

I'm using ACR 6.whatever, and I find that when I set it to use lens profiles to correct distorsion/CA/vignetti​ng I am still left with some CA after it does its thing. Curiously, pushing the CA slider down to zero or up to 200 doesn't seem to have such a pronounced effect on the end result. I believe I'm looking at purple fringing rather than lateral CA so perhaps ACR profiles don't handle that? If it matters, the lenses are Canon's 24-70L and 70-200 f/4 IS. Does anyone have a similar issue, and is there a way I can easily get rid of that?

I'm afraid I'm away from home at the moment so no examples, sorry.

I also find that while good, its not great (although i find LR4 to be better).
If its still really noticeable i tend to reduce the Magenta and or Purple a bit, as long as the rest of the image isnt effected too much.
My old 85mm f/1.8 was the only one that really needed extra work, cant say ive really noticed in with my 70-200 f/4 IS.

Comparison:
Really only marginal improvement.

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