SSRS Stacked Bar Chart Smart Label Problem

I have a SSRS 2008 Stacked Bar Chart. When the bar values are close then the Series labels often merge and overlap making the value unreadable. I have set the properties so that Smart Labels AllowOutSidePlotArea is true, NoMoveDirections Right = False etc. but they still overlap.

How do I set so that the values are plotted in a readable manner?

Thanks