actually if you look at the picture of the tfource car Johnnywhopper posted coming out from CRC it shows a regular fiberglass tplate without the tweak springs. and that setup even has the center screw in the tpale to make it even stiffer. and that's a 11x2 mod motor I believe in it. (tplate for mod and links and springs for stock) I don't think you would want the graphite tplate and tweak screws. that would be a push. all pun intended
as for spring on the shock it looks like a green springs which is soft. but for stock since you're not pitching the car in the corners you want it as stiff as possible so the graphite the tweak springs white or red depending on how tight the track is and a silver spring. remember your not pitching the car your not looking for traction because you're not going as fast. you adjust the finer points with preload and tension. the the softer the car the more rear bite you get. stiffen the center shock you get more steering. you want the car as stiff as possible without losing rear traction. but ALL tracks are slightly different. so finding something that lets you go 10 10th at your track might require a variation at another track and even when the track layout changes at your own local track.
hope that helps