The reason why +/- is never shown in a player's stat's log is because the stat is mostly meaningless in the context of an individual player's stats history. The value of the +/- stat is in a game box score, to see which players on a team were perhaps more or less effective. Game by game, though this stat will vary based on opponent, what other players were in the lineup, etc., and tells almost nothing about an individual player without the context of the game box score.
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!