The only reason to run 18X10 in the rear with that high of an offset is looks. The S2K does not have enough power to need a 285/30R18 rear tire. You are going to really make the car push in corners. Also with that high of an offset you are tucking the whole thing under the car. A lower offset and slightly narrower tire would handle better. Also with the added unsprung weight you would loose performance.
If I can help let me know.

 

I would do
18x7.5 53mm offset front
18x9.5 73mm offset rear

225/40 18 front
265/35 18 rear

Remember tire choices as well as alignment can be a big influence with understeer and oversteer... SO2's in those sizes were pretty neutral.... kumho mx's in those sizes felt similar as far as balance... I tried kumho 712's with even smaller tires in the rear (255) and the car had lots of understeer... maybe the compounds for the 225's in the kumho 712's were a bit harder? than the rubber for the 255's. I also reccomend the "european" alignment for optimal handling that can be found in the under the hood section of the board.

Regardless, if you drive the car vigorously <highly reccomended > you want to make sure you have plenty of clearance with suspension compression especially with your drop. You will see lots of suspension compression on the dragon particularly while turning which requires more clearance in the front.

 

With that drop and those rims and tires, he's most likely going to grind his wheel well splash shield down to nothing in very short order.

 

Guys do i hear any pros or cons to the set up ccarnel suggested?

Moron