How to visualize tally counters (Serial Diff maybe?)

Got to a pretty good state using the Visual Builder (though I cannot do the ratios / diff between series like with timelion).
The trick is to add an extra FilterPositive agg as child of the SerialDiff to remove rollovers.

Last little gripe about Visual Builder: why are the same values using different colors in each graph? Anyway to fix in Kibana v5 latest? Thanks!