LifeNext was too old, I couldn't recall what's intended exactly. However, it's known that LifeNext has a lot of bugs ;) In my test bed, it even performs worse against Scalar which yet has no knn. Anyway, thanks for reporting the bug, I will do some investigation later.
The virtually wide/split dangerous area is just per debug graphics limit — you can't paint too much due to robocode graphics performance. It's actually not really affecting anything.
First of all, thank you for your response. Actually distance between bullet and robot may be better than just bins since robot width stays the same no matter what the distance is.