I think the Perk this or Perk that argument often is out of whack. The K4 was said to need to be perked for the longest time because the muppets and a few others were able to fly it with lethal efficiency. Put it in the hands of most noobs, and the plane is unflyable, and definitely not something they can rack up kills in. It has a big gun with very little ammo, and a big engine... everything else is left up to the pilot.
In comparison, things such as Spitfires, LA7s and P51s just about anybody can get in and have a decent change of landing a kill just based on the fact they're fast, maneuverable, and carry a punch, plus are mostly stable platforms that lend themselves to a heavy hand on the yolk.
I don't find the M's to be that daunting or in need of perkage. I think it more has to do with people effectively using a plane skewing its numbers.
IMHO, it's no different than the people complaining about F3 in an IL2... it really didn't change the effectiveness of the plane for those who know how to use it. It just made the negative G flopping of a few no longer a viable tactic when you can't see behind you.