Mmm... but that doesn't really solve the core problem, which is the balancing of the drop rates. You must have been really lucky to get 5/5 brains from rabbits. The chance for each to drop one is 35%. I could probably lower the rate across the board slightly, for all animals, by 5-10%. Don't really want to go lower than 15% as that gets into the territory where it was reportedly too low.
(This is @Taska Raine, just replying on a different forum account temporarily as the account used to create this thread is locked from posting due to anti-spam measures currently in place)