Needing twice as making wingers as Centers is true in our league as it is the NHL......and Centers in our league produce more points (value) than wingers by virtue of their ability to generate extra points by taking Faceoffs.
This is already true in our league....
Phil Kessel a winger had 80pts in 82 games, for 88.27 fantasy points.
Anze Kopitar a center, had 70pts in 82 games, for 91.64 fantasy points.
So Kopitar, despite scoring 10 less real world points, scored more fantasy points specifically because he's a center who generates added points as a result of his position.
Added production/value for centers is already baked into the pie.