I am going to suggest that your saddle may be too high.
You should have no rub. No movement at all. Your sit bones and everything should pretty much be stable on that saddle.
When your pedal is at six o'clock, is your leg totally straight? Try lowering the saddle a tad so that your leg is slightly bent, and see if that works?



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It's kind of weird looking, but you can see how it moves around quite a bit.
