I have the FSQ106ED with the captains wheel. I have not noticed any flexure yet but don't have the sort of payload attached either. The wheel on mine has been locked down since I took possession of it. You might want to consider a rotator in the mix to alleviate using the wheel. There is plenty of back travel on the focusor so that and an OAG should fit in nicely.
I have not noticed any colour caste either. Overall it is a nice scope with very sharp optics.
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