Help needed with coilover height problem

[-TMK-]

Okay.., I thought that I share this here.

I have Eibach Pro Street S on my car and I'd like my car to be even lower, but adjustment ran out from behind. There's still plenty of adjusment (about 4,5 centimeters) left in front. I wonder if I may shorten the rear springs by myself, or should I try to look for shorter ones (if any?) Or what should I do?

Here is the patient atm.

[-TMK-]

Problem solved. New, shorter springs incoming.