When using Save For Web & Devices, you disable “Convert to sRGB”. Yes, there's a few things to change, but you'll be better off for it — all color values will remain exactly as you set them, display correctly and export correctly. Once you've set Illustrator up like that, you should do the same for Photoshop.
We place .psd files into illustrator for packaging graphics. Example (Crest toothpaste carton). What I am trying to achieve is a trap of CMYK in an image to a vector or other raster element in an illustrator file. The only way I have been able to achieve this is to use 2 separate images. A CMYK image set to darken or overprint in illustrator
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