Lowering FK models

Does anyone have any springs or suspensions in the FK? Got the FK3 and would like to have springs used. For me, the question is about driving behaviour and popo-meters? My requirements: FK3 with 18″, vehicle should lower but the small should not fall out of the back of the pacifier. I heard H&R is too hard! I found: springs: – H&R 30mm – H&R 40mm – Einbach 25mm suspension: – K&W 20-50mm – Honda 25 mm Can anyone describe their experience and possibly also their sideways Upload image? thx mäc