[EricH]

I can't find anything saying it's illegal to put a 30A in a 40A slot. Best practice? Maybe, maybe not--I'll defer to the EEs around here on that.

However, you have to use the supplied 30A breakers, or identical ones, in the PDB. That means that you're going to be redoing your PDB unless the KOP 30As will fit into the 40A slots (which I'm guessing you've already tried). If the 30As don't fit into the 40A slots, then <R42-B> effectively prohibits 30As in a 40A slot.

Unless you're coming in on Thursday, you've got Wednesday night and all morning Thursday to get ready to compete.