It would be great to see how DR has improved over time. That way you could attribute specific links to increases in DR and provide reports over time.
And not the way it's currently being provided on the dashboard. It would be more helpful if we could see actual data values on the x and y axis and even export it.
Or it would be nice to see DR as part of the tooltip on the the RD graph (all of the graphs would be nice too).
Here's a basic mockup of the latter option.