I'm getting worried that the C-Hog may be unperked because no one has come up with workable reasons for keeping it perked yet. So I have to step in
First, the reasons that do not work:
Obviously, the C-Hog cannot be perked on the basis of any special performance, if anything it is actually slightly heavier than the unperked Hogs, fuel load for fuel load.
It cannot be perked on the basis of firepower, because there are several unperked quad Hispano and quad-cannon birds. Of these, the Typhoon is much faster at typical low alts, and also a good jabo, the HurriIIC is much more maneuverable, and the N1K has quad-cannons, a generous ammo supply, carries bombs, and also is very maneuverable. There are arguably better buff-hunters, since the C-Hogs ROC is rather anemic, it is bizarrely susceptible to engine-stoppages and pilot wounds, and something packing 30MMs might be considered better for buff-busting.
So the C-Hog is a very good, very dangerous plane, but probably not completely overwhelming. Thus the notion of protecting the MA as a whole from unlimited C-Hogs makes for a weak justification. Instead, the best reason to perk the thing is to ensure that the much more common and representative .50 cal Hogs will see use. Which is a good enough reason if you ask me. 19 pages before someone justified the C-Hog's perk status...wow.