Deflector not deflecting extremeties of fragments

I have a simple object that I am using PArray and Pbomb to explode. The object
is setting on a plane (floor) and I have a deflector at the same position as the
floor. Upon exploding the fragments bounce off the deflector, however, portions
of the fragments go through the deflector. It's like the deflector is deflecting
only from the center point of each fragment. In the real world, no part of the
fragments would go through the floor, right? How do I fix this?

I started to use Pflow, but to explode an object sounds very complex. What I
have now works perfectly if the deflector would just work correctly.

Using Max9.

thanks for any help,