PolarChart margins / padding

[PapLabros]

I am trying to remove the margin that is added by the angle labels. It seems that the margin is calculated based on the width of the biggest angle label assuming a horizontal alignment. In the two screenshots I am providing the labels' rotation has been adjusted, yet the margin is still persistent. In the second screenshot you can see that when the size of the labels is growing so does the margin. The polar chart in both images has a fixed width and height of 600pixels and is highlighted by the brownish area. I have tried using the FitToBounds property to achieve what I need but couldn't get it to work.