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When I had a more careful look at your sectors... I realized that arrangement doesn't look right at all.
You have two segments, and they are not in the same plane. And it is very hard to adjust them properly.
Further, if sectors surfaces are not ground properly in some sort of jig, (which will be pretty heavy and large), to form the cone-like surface, you will have issues like you describe (including slippage) because the contact points (lines actually) with shafts are not concentric (they should intersect at the third bearing or at wherever the pivot point is).
Shafts should also be grounded for maximum tracking accuracy IMO.
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