Crab,
if you consider the disc to be flat to begin (I know not correct but easier to explain and should not affect the figures), and the centre of mass of each blade to be at radius R from the centre.
As there is a linear relationship between angular momentum, rotational speed and polar moment of inertia, then if the rotaitional speed increases by 10%, the polar moment of inertia must decrease by 10%. As the mass does not change, this requires the effective centre of mass to be at 0.9R from the centre of rotation (okay, 0.909).
To achieve this, the blade must rise by anticos(0.9) degrees, which is 24.6 degrees.
Similarly, if you raise the blade by 10 degrees, the affective radius becomes 0.985R which would give a 1.5% rise in rotational speed.
This could be entirely flawed logic of course!
I don't dispute the Lynx has coning; of course all a/c have it to varying degrees, but these angles are very large.
What I actually believe is that there are a range of influences simultaneously acting to varying degrees. However it is far too complicated to explain them to student pilots, and so the CoAM theory is used as a simple explanation.