PolarChart Reverse Radial Axis

I have a case where I want my polar chart radial axis to go from the center 90 out to 0, instead of the normal 0 out to 90. Is it possible to flip the axis for polar charts. The axis method setReverse did not work for me.
The only solution I have thought of so far is just to subtract 90 from all of my data so it is plotted correctly and then change the labels to text labels instead of numbers so it looks right.