Normally you are spot on but this time I have to disagree. I always build my mug v1 with KF4 on it and it flies great. I think it helps in windy conditions and give durability to the plane. I built my first one with a KF2 and it would not for the life of me fly inverted without a lot of down elevator and I have to fight it the whole time. Then I installed the KF4 and love it
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Interesting, I'll have to tape some on sometime and give it a try, most people I asked said not to bother with Kf on the V1 Mig, but I'm always up to try something new!