Tone Curve in Profile Help

Question

Hey all,
Hoping the more talented tech gurus can help me out a bit here?
I have custom camera profiles for each of my cameras, so that my colour is consistent across bodies.  They're all dual illuminant, some made in the old DNG profile editor, more recent ones in the Lightroom plug in from Xrite (Passport).
The colour is excellent, but I always find the tone to be too contrasty for my preference.  When I look at the values on the step chart (greyscale patches) part of the McBeth checker they are not uniform / linear but rather already hold a contrast adding tone curve.  What I do in Lightroom is to take the TAT tool in the curves panel and move these points per patch until they are almost "linear" again.  In effect I apply a custom inverse S or reverse S to the image.  I then save this curve per camera and invoke it on import setting along with the colour profile.  I LOVE, LOVE the files I now get with this calibration, skin tones especially.
BUT
I now have my curve area of Lightroom being used essentially for calibration purposes, which robs me of it's use for creative purposes.  Thus, I'd like to do this tonal adjustment at the profile stage, in the .dcp file to free me up to use the curve panel to suit my artistic vision.
SO
The question is how do I visually target the tone curve in DNG Editor (or passport) to match those which I have created in the curve panel now?  I can eyeball it so they look similar, but it's a bit vague.  Either that or a way to visually adjust the tone curve while viewing the grey swatches within the DNG editor?
The result should be the same as my custom camera profile plus my bespoke lightroom tone curve but all done in the .DCP file.
Am I missing something?  Willing to be schooled always!
Many thanks if you made it this far.
(Note: I have posted this in LuLa too, so apologies to those who may frequent both)

Answer 1

Here's a Lightroom tone curve (saved):
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.5-c002 1.148022, 2012/07/15-18:06:45   
">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about=""
xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
   crs:Version="8.1"
   crs:ToneCurveName="Custom">
   <crs:ToneCurve>
<rdf:Seq>
<rdf:li>0, 0</rdf:li>
<rdf:li>99, 92</rdf:li>
<rdf:li>166, 156</rdf:li>
<rdf:li>231, 223</rdf:li>
<rdf:li>255, 255</rdf:li>
</rdf:Seq>
   </crs:ToneCurve>
  </rdf:Description>
</rdf:RDF>
</x:xmpmeta>
and here's the same tone curve in a .dcpr file:
<dngclr:ToneCurve rdf:parseType="Resource">
    <dngclr:Edit0 rdf:parseType="Resource">
       <dngclr:X>0</dngclr:X>
       <dngclr:Y>0</dngclr:Y>
    </dngclr:Edit0>
    <dngclr:Edit1 rdf:parseType="Resource">
       <dngclr:X>99</dngclr:X>
       <dngclr:Y>92</dngclr:Y>
    </dngclr:Edit1>
    <dngclr:Edit2 rdf:parseType="Resource">
       <dngclr:X>166</dngclr:X>
       <dngclr:Y>156</dngclr:Y>
    </dngclr:Edit2>
    <dngclr:Edit3 rdf:parseType="Resource">
       <dngclr:X>231</dngclr:X>
       <dngclr:Y>223</dngclr:Y>
    </dngclr:Edit3>
    <dngclr:Edit4 rdf:parseType="Resource">
       <dngclr:X>255</dngclr:X>
       <dngclr:Y>255</dngclr:Y>
    </dngclr:Edit4>
</dngclr:ToneCurve>
If that's not enough to go on, do tell..