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I would check the shape and position of the sector first. And polar alignment, if not accurate will produce the same effect.
Slippage is unlikely (however, I can see some marks on the shaft(s) where the sector is riding that could have been created by grinding on sector, possibly earlier?).
Try to see how much force/imbalance you need for the sector to start to slip...
BTW, do you have (or plan to have in the near future) some sort of hand-paddle with faster/slower buttons to compensate for inaccuracies in alignment? you may add additional motor to elevation shaft as well, your processor is capable of handling that without problem.
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