Proper ride hight for DD/Auto X

[Red coupe]

I just got KTS coils and will be putting them on soon and Im not sure were to set the height at. My first though would be to find the best mix of The control arm and tie rod being parallel to the ground for the front, and the lower control arm parallel in the rear. I also just tightened the preload adjustment by hand until I couldn't turn it any more (so almost 0 preload,just a snug fit) I plan on setting the preloads once Im back in school and can get the car on scales...

So is the the best set up If Im only concerned with lowering for performance gains?