I also have a KK with my new pool and experience a lot of the same probs you are. Constantly have to babysit the thing, so much so its almost easier if I just vacumn it myself. I hate when it gets stuck above the water line and starts sucking air, what a pain. Did you try messing around with the weights, I had some success moving them around. I think it also came with directional eyeballs that prevented the KK from being pushed away by the return jets.
Overall, I guess it was a good product like 15-20 years ago, but now I guess you get what you pay for... mine just came with the pool.
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