Hi Bob,
This is one of the reasons why I prefer not to use boxes with feet if at all possible. But the CB110 is a nice box and it looks like the racks you have are keepers so making it work is a good idea.
Having not seen a CB110 in a while, my first thought is to use a file or dremel to but a bevel on the back edge of each foot. But if the foot is actually ring of plastic with a hollow center this may not work so well.
If the racks are only held together with screws you could also take them apart and have a bevel or bullnose on the front edge of each shelf. If you or a friend have a router mounted on a table this would be pretty easy.
Or you could do a combination of both.
I hope one of these works. Maybe somebody else will have a better idea.
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Currently keeping:
6.10 Gonyosoma oxycephalum (Javan, mixed colors)
1.1 Philodryas baroni
1.1 Lampropeltis triangulum multistriata
1.0 Rhodesian Ridgeback