Comment #1 on issue 944 by cunningh...@gmail.com: EyeSee chart Legend issues http://code.google.com/p/moose-technology/issues/detail?id=944
Interestingly, if instead of using #yAxisLabel:, I instead use #diagramTitle:, it moves the left 'y axis label' down beneath the legend, and it is at least readable. In fact, it looks better as a label - but not as a diagram title.
Of course, this still does nothing for the verticle legend overwriting the rigth axis.