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@Scilly.Suffolk
Meh.
For sale: Rotor Q-Rings...
Even with the chain too tight with the greatest radius engaged, it was way beyond track slack with the small radius.
So how come Biopace work and Q-Rings don't? I suppose the shape is too extreme, Sheldon writes that "The shape of genuine Biopace chainwheels is not a simple ellipse, but a more complicated shape which Shimano described as a point-symmetric egg curve." Where as the Rotors are (closer to) a pure ellipse.
The 40t inner looks less extreme, but TBH I CBA. :(
I might give it another go if I happen upon some Biopace though...