Building the average of these 3 reading lists I'm getting this:
no_lut_active: 27.17, 27.11, 27.17
lut_active_lightspace: 25.33, 25.50, 25.33
lut_active_madvr: 24.22, 24.61, 24.55
These numbers don't really suggest a clearly visible color deviation, do they? I do wonder why lightspace seems to be somewhat brighter than madVR, though? How did you get those lightspace readings? I suppose lightspace has its own internal renderer?
Anyway. The big question is: Where does this cyan push come from, if the readings via "color picker" suggest a fairly neutral gray? Here are a couple ideas what you could still try:
1) Make a PrintScreen of both LightSpace and madVR's output. When displaying the PrintScreen in MS Paint, do you see the same results (meaning neutral "color picker" readings, but a cyan push with the madVR screenshot)?
2) Have you tried resetting madVR to default settings?
3) You could try creating a new image in MS Paint and manually draw a color which matches either the LightSpace or madVR color picker readings. Can you reproduce the cyan push that way?