[Expert@ApexWheels]

With the KW Variants/ ST Coilovers, you would hit either the spring perch or the bottom of the spring itself with the V shaped springs, not the strut itself. In order to fix this issue with wider wheels, you would want to switch to a linear spring.

With the 18x9.5" ET22 fitment, depending on your ride height and street tire size choice (265/35/18 AD08s in your case), the tire may hit the spring perch or spring (in which you mentioned it does), so you can add a small 5mm spacer to push the tire out away from the spring perch or spring. This is not detrimental to your car's performance at all, but if you don't want to use a spacer, you can go with the 255/35/18 street tire size, where you should be able to clear the front with no clearance issues without the need for a small spacer. You can also raise the ride height of your car so that the spring perch is above the wheel and tire so that the tire doesn't hit the perch. However, the best solution in our opinion is to change the KW V-shaped springs to the 6" linear race springs for proper fitment and to be able to run the 265/35/18 tire that you have.

The KW spring perch accepts a 60mm spring, thus you should look for a 6" 60mm spring from Swift, Hyperco, Eibach, or H&R. This will allow you to remove your V shaped spring and raise the lower spring perch higher.

KW Clubsports have a similar issue with the 18x10" ET25 wheel due to the helper spring that it utilizes, thus also needing a small spacer or removal of the helper spring (since the CS already uses linear race springs) to raise the spring perch up above the wheel & tire.