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You might find some answers in this thread:
[lolachampcar] Performance Upgrade Efforts
Somewhere near the middle of the thread there are some pictures and explanation of creating adjustable height mounts for the coil springs.
I'm interested in this, too, but my biggest concern with changing the springs alone is that the stock camber is already aggressive and gives accelerated inner tire wear on the rears (especially on the 21s) and is going to be that much worse with lowering springs.
Niclas, post soms bwfore/after pictures please?
Looks great, although a little hard to see with the black wheels. Did you snap a pic with the 19s while lowered?
You said 30mm lower groove. Depending on the front and rear motion ratio, the actual lowering will be more and might. Be different front to rear.