I always thought that myself Leo re Kukki sparring. Although it is full contact training, the stategies employed within Kukki sparring seem to favour speed over power. I witnessed incredibly fast and accurate kicking at a WTF class by a black belt, but he didn't seem to have any power in his kicks at all. I suppose those are the rules of the game.
Regarding the sparring not reflecting the core of the art, I think that is an similar issue some Karate practioners have also expressed about Karate and Kumite. Certainly I found Chang Hon TKD to be the same.
"Let your food be your medicine, and your medicine be your food"