There is now a second version of the tool which allow more accounts (up to 50) in the graph, and hovering highlights the relevant arrows.
http://www.steemreports.com/votes-graph-enhanced
Because these graphs are are quite time consuming for the server to create (taking up to a minute), the number of previous days covered has also been reduced from 14 to 7, for both this and the simpler graph tool. This actually seems more useful though I think.
I haven't yet added this tool to the website, as I want to see how the server copes before adding any extra traffic. I may need to upgrade the server in the next few days if it is used much.
Also, thanks to @transisto for alerting me to the problem with the graph window being too small in some cases, front-end design isn't really my forte! It should have improved now though.
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