learning how to handle distro is one of the most fun parts of the game, as far as I am concerned, it works exactly how it theoretically should over the course of a season, but in any one or two games, it can be a little goofy,
what jeff said about who is on the court with who is very important, for example, if all the starters were set to 15% and played exactly 20 minutes - all together, and 4 reserves were set to 1%, with the 5th reserve set to 4% and also played 20 minutes all together, the 4% reserve would have run for him approx 2.5 more plays than ANY of the starters, and the reserves would get approx 62% of the plays that the starters got.
this is not immediately intuitive, and confounds at times even some of the top coaches.