Just some insight from my setup...
New suspension setup:
JDM Spec B bilsteins all around
-Fronts on LGT specific swift sedan springs (corrects front ride height)
-Rears on OEM JDM springs (stiff like the swifts) and 3/8ths Subtle spacers/extended lugs to correct rear ride height.
Overall it rides firmer but not harshly, like some setups do that ive been through on my other subarus. Theres about a 2-finger gap on each wheel still, measuring 25.5" from top of fender to ground in front and 26" from fender to ground in the rear. It was about 27-27.5 before all of this all around.
Please note, this is on a 2.5i model, not a GT. I dont think these modifications are required on other LGT or Spec B (US) models to make JDM spec B suspension work due to the fact that those models are heavier with bigger motors/transmissions, compressing the suspension, esp in front, a little more. The issue with my 2.5i with the Spec B stuff was that it rode really high in the front because of the lack of a larger motor/6spd pushing down on it.