I would like to make the diagram

            A \arrow[r, bend left=40, "H\circ r", ""{name=U}]\arrow[r, bend right=40, "K", swap, ""{name=D}]    &\textbf{Abcd}\arrow[Rightarrow, "\eta", from=U, to=D].

perfectly symmetric. I've been trying to change the parameters after the bend left/right option but I don't think this is the right way to proceed. Is there a standard way to act, which is "robust" with respect to the whole diagram?

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