sharkatron (I love typing that), I don't know how much either M3 control arm or the Rogue toe arm did separately since I got them installed at the same time.
I also can't answer your main question, about how important the rear camber link is, because I don't have that piece (I have regular 135i size Koni shocks). I do remember someone once asked Harold Lin to prioritize the various rear arms and he answered, "Guide rods, toe arms, lower camber link and upper arms".
Putting it in perspective, the M3 rear subframe bushings fixed some pretty huge deflections, like a 1.5" bounce over bumps. The M3 rear arms plus Rogue toe arm fixed some smaller deflections, maybe 0.25-0.5". Now it feels right to me, so I don't feel like there's still something that needs to be fixed. There might be another 0.25" deflection left somewhere for the camber link to fix, but nothing more than that.
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