I'm fully in favor of the 14 being unperked for sure, but I don't think the K4 needs to be perked or even brought down in eny. Of the two, the K4 is simply harder to use effectively, harder to see out of, much harder to control, with the torque being such a giant factor in it, and a very poor turner, until you get a hand on how to make it work for you. I've never seen the Spit14 as a major threat when I've run into it, but it does have way better guns and is easier to fly overall.
Just the other day several of us were in the DA and someone wanted to fly Spit 9s, I accidentally got a 14 and was turning with the 9s without any trouble. And I essentially never fly spits. So it's not really that hard to turn with either, it's just not quite as point and shoot as the 8 and 16 is. It's a good plane, just not quite perkworthy in my opinion.