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Shadow volumes

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Hello, I've been working to use shadow volumes on PSP. The problem is that PSP does not perform clipping, it just culls off primitives wich vertices goes offscreen. So if i try to render my shadow volume the rays are culled and the shadow volume is not rendered correctly or more often it disappears. in the last screenshot the shadow volume is culled bcz it goes over the guardband. I Was wondering if it's possible to clip the shadow volume or add caps for all the frustrum planes (left,right,bottom,top). I've tried to clip the volume using the Sutherland-Hodgman's polygon-clipping Algorithm but it didn't work. Thanks in advance

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