That is quite abit of research in that second link. I do notice two different spring rates for the cc627 in the first link. I'll have to peruse them more closely. I can see there are many choices.
I do have(or at least think I do) the original springs my friend took out of his silver T. He was going to throw them out. I'm a pack rat, I just have to figure out if I still have them. Might try em to see if it brings the car up some.