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 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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