If you look at the IFI power distribution diagram, the 40amp loads go through a gold-ish block that caters to four motors and a black power distribution block (I think these terms are correct..
). My team is using 5 CIMS, not 4, so we decided to buy the 2005 breaker panel that can hold 6 40amp loads instead of just 4 (it lookes much easier to wire, too).
I recommend AGAINST hooking up any of the 40amp loads to 30amp fuses.
So, if you have 5 or more CIMS, I suggest you rush order the 2005 breaker panel from IFI. If you have 4 or fewer, take a good look at the power distribution diagram in the FIRST manual and wire accordingly.