[RSTarga]

Elephant rubber bushings are excellent.
I wouldn't drop it below Euro ride height.
Make sure you don't have US spacers at the top of the shocks.
You don't need bump steer spacers unless you are dropping below Euro.
Bump Steer is NOT the same as Kick Back. The spacers keep the camber curve back into relationship with the suspension after lowering your car.
Why do you need the spring plate kit? Are you planning on changing TB's and or ride height constantly?
Definitely corner balance when you align and change ride height, even on a street car.
I prefer Bridgestones too, but the Contis are probably a comfortable ride.
If you want a softer ride don't use sport shocks, their softest setting is normally harder than normal shocks.
I wouldn't use 15's as the tire choices are really limited.
If you want a nice ride don't use larger Torsion bars.