On my diesel I have bilstein HDs all round with 2.5 coils in the front and 2 in the rear. I really like they way my car handles really made a difference even with stock sways.
Heating the coils will weaken the springs a be to soft
Another thing I've been told you can cut too much on a 700 series. I think you can get away with 2 coils maybe a little more.
