SSRS 2008 R2 DynamicHeight enormous whitespace
===

Trying to make a horizontal stacked bar chart in 2008 R2, the number of rows is unknown until runtime so I'm using the dynamicheight property of the chart to increase as necessary - the chart space increases, but the chartarea inside of the chart has a great deal of whitespace above and below...

![Selecting TOP(5) Rows][1]


![Selecting TOP(50) Rows][2]


If I select 5 rows, I get the first image
  [1]: http://i.stack.imgur.com/uYUFl.png





If I select 50 rows I get the second, note the increase space between the border and "Chart Title" and between "Chart Title" and the actual chartarea
  [2]: http://i.stack.imgur.com/6rEhR.png


My DynamicHeight property is set to =(1 + COUNTROWS("DataSet1")/2) & " in"

note that I checked out the other StackOverflow question regarding extra whitespace at the bottom when switching to print format, but it doesnt seem to apply to me.