I don't know about the Edge, but with my Creek Hobbie's Extra, the range is 26-30% back from the leading edge. I would think you could apply that same range (which seems fairly typical among other planes I've seen) to the edge. It works out to about 4.29-4.95" on the Extra's 16.5" chord wing.

If it's anything like the Extra I would go a little on the nose heavy side of the range. The Extra was very hard to fly when I was (embarrassed look) past the tail heavy side.

Mike