We had a pie chart with 9 slices with limited plotting space. The labels are overlapping and random at best and not presentable at the moment. 

We tried the following scenerios:
  ThisPieChart.IntelligentLabelsEnabled = true;
  ThisPieChart.AutoLayout = true;
  Alternate the bigger slice with smaller slice to give good space for labels.
  Printing out in Black and White paper also is a mess as patters are not there on the slices.