What do you plan on using your car for? Regular driving, drag racing, auto-x?????
Since the Evo is primarily an understeer car, with the EDFC the way to compensate for this is the set the rear to full stiff (10) and the front to full soft (0).
One problem with the Tein's is they were manufactured 'wrong.' Since Tein's are primarily bought by people who use their cars for serious racing or are gettin into it.
The reason they are 'wrong' is the fronts were made with 9kg springs and the rears were made with 7kgs springs. This is completely opposite of what you want to have. If the Evo was an oversteer car, then this would be correct. But since it isn't you want a stiffer rear than front.