Lowering springs

[Cerbera]

I'm currently using a Eibach Pro kit on my CLK55 W208 and I'm happy with the ride height but feel the ride could be firmer. I was thinking if there would be any advantage to changing to H&R lowering springs?
Does anyone have experience of both?

 

[Abdul]

H&R's are normally firmer then Eibach's pal. Though I'm pretty sure you said you had the 50mm eibachs in which case they're sportlines and slightly stiffer then pro's anyway.