Many players have a dozen or more cores deployed just to operate mining units. This is because they have the skills to support a large number of MU, but can't effectively use more than a few of them on any single tile because the tile does not have sufficient ore available, and because a single core can't be placed at a tile-edge and used to operate mining units on multiple tiles.
As such, in order to reduce the number of cores individual players use I propose that the both the ore available on all hexes and the taxes on those hexes be doubled, as this would allow players to concentrate their mining units on to a smaller number of cores, reducing the number of hexes and cores they'd need while still maintaining the current balance of taxes to ore.