Selective Color Correction - Adding to multiple channels

Hi - I am using CS3 on a Mac OSX 10.5.6
I am experiencing an oddity when making color adjustments with Selective Color Correction. I am working with RGB images trying to adjust to get colors in gamut and to maintain detail before converting to CMYK. As an example, I have an image comprised of various red items. I want to add cyan to get some detail for the highly saturated areas. Regardless of the Relative or Absolute setting, when I add cyan I am also getting a lot of black added. By the time I get a 3% dot in cyan I may have 10-12% K. When I reduce the black it also reduces the cyan.
Is this because I am in RGB mode? I want to make these adjustments before separating to CMYK so I can keep detail that is getting blown away in the conversion. I would have hoped that because it is controlled with sliders for CMYK it would isolate it's effects to the specific channel but that is not what is happening.
Any ideas?

I am working with RGB images trying to adjust to get colors in gamut and to maintain detail before converting to CMYK.
If you are trying to bring totally oversaturated RGB colors into the CMYK gammut, then ideally you will have to learn about channel mixing. It may be necessary to reproduce the Cyan channel (Red) by finding detail from other channels. Selective color, as you've discovered can only take you so far.
Luminosity blended Hue/saturation adjustments taken to low opacity is another high end tip, and work around. If you cant deal with the complexity of masking and channel mixing

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