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The fuel mixture too rich sounds to me like one or more injectors are on their way out. I would swap them out and see if that fixes it.
As for the smoke and oil burning, have you measured how much it is burning? With catless downpipes visible smoke is considered normal on our engines, I am surprised yours didn't for so long. Most S63TU engines burn oil, at any mileage. As long as you keep checking and filling when needed, everything is fine.
Your car looks amazing, it really isn't worth selling / getting rid of it for the value it will bring. I think the F10 M5 is the best M5 imo, the V8 Twin Turbo has tons of power and a very unique sound, RWD is pure fun, and the DCT transmission sounds and shifts incredibly.
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