Hi Flamerfox,
I could be wrong here, but if there is a way to change it, you might need to edit the main increment value under the "Tilemap" class (I think that's the name), an I believe that class controls both the character positions and the grid size, if it does, you might need to adjust you maps after editing, as well as the pathing and depth.
I hope that helps, sorry I don't know more.