Try this from the rules:
Outside Scoring, Def: Both guards weighted heavily, small forward medium, power forward slightly.
Inside Scoring, Def: Center weighted heavily, power forward somewhat heavily, small forward medium.
Rebounding: Center and power forward weighted heavily, small forward somewhat heavily, both guards medium.
Offensive Flow (how well the offense produces assists, avoids turnovers): point guard weighted very heavily, shooting guard weighted medium, small forward weighted medium.
You decide a numerical value for "very heavily", "heavily", "somewhat heavily" "medium" and "slightly"; plug and play around.
(I'm not saying this is the best method of editing parameters, I'm just throwing out a suggestion)