Spherecast for Ground Check in World Space?

So I am trying to do a ground check on my ball character to keep it from jumping while still in mid air.  I thought I would try using a spherecast since it would also take the width of the ball into account.  I had jumping working either all the time without taking the spherecast into account (not what I want) or the ball would only jump after doing a complete revolution, as if the spherecast was rotating with the ball also.  So this is my new setup:

The problem is that now the ball will not jump at all.  I'm new to all this, so clearly there is something I'm not understanding.  Any thoughts?

Thanks!