What did you put on for summer tires? What size K02's were you using? It's worth pointing out that in order to have an honest comparison between tires the same size needs to be compared. Same with the class of tire - if you went from a K02 down to a highway designed tire then of course the K02's are rough and noisy, but you didnt buy them so they would be quiet and smooth haha.
Agreed.. I had LT285/65R20's for my BFG KO2's. I've always run 40psi cold (drivers door jam sticker calls for 39psi cold front and rear), and rotated every third oil change, too. And I don't care one bit about fuel economy nor smooth, per se. But, I expect balance and tractionability! (is this a real word....lol
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My issues with the BFG's was balance first and then traction in wet second, and not noise. And I found that the more they aged the more balance issues occurred, and the less they hooked up, too. It was at the beginning of this summer that I had enough (third summer on them) where it was between 7+oz and 10+oz per tire that it took to zero out on a road force, and even then at 100km/h to 120km/h there was still ridiculous vibrations, and wet traction was garbage, for my tastes, that is!
I put on LT295/65R20 Michelin LTX M/S tires at the beginning of this summer and the difference has been appreciable. These are fantastic tires that deliver what I expect in my chosen road conditions.