[Kracka]

Based on those colors the coilovers sound like GroundControls to me. The springs should be red with white lettering/numbering. GC coilovers do use linear rate Eibach springs, but they are nowhere near similar to Pro-Kits. Write down the spring part numbers and give GC a call; they can look up the spring and tell how how far the car should be able to go down, and if needed, they can recomend a new spring for you based on your needs.

A perch is the piece that threads up and down that the spring sits on. They have a little locking hex set-screw correct?