Hi MKark1!
I'm unable to inspect your updated project at this week - I'm not at home.
So first of all it is great that you were able to solve the error.
I will return and see our project.
As about your new questions.
I suppose that one bank could support more than 1 SERDES, but I need to check your particular case.
As about mapping a clock to non-dedicated clokc pin - it is a bad idea and you better avoid doing this,
in that case SERDES IP couldn't be able to use PLL to compensate for a phase difference between clock and data.
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Best regards,
Ivan