I have two planes in the scene.  One plane is a shadow catching plane right under the car with Shadow_Catch_Only checked in its material properties.  The other plane has a background photo applied to it and is behind the car and the shadow catching plane.  I have one IBL light and one Infinite light directly above the car and turned on shadows and ambient occlusion for both.  I did some renders and can't seem to get the contact shadows under the tires to look right. This thread has more detailed info on my scene setup.

 

So what ambient occlusion settings should I use in the light settings to get a softer looking and better distributed contact shadows under the tires?

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