I found this setup to be a good balance of handling and comfort. I felt like body roll and duck/squat was well controlled and that bumps/dips in the road were not jarring. And no I never bottomed out, it's simply not that aggressive of a setup. You have to remember how high these cars came from the factory haha. I liked the Koni Yellow and Eibach Sportline setup, but for anyone not going with coilovers I would recommend Koni Yellows paired with Eibach's Ground Control coilover sleeves. I feel like it does everything the Sportline setup did but better. And you can order the GC springs in a gamut of rates, I went with 10.7k front and 8k rear.
With the sportlines did you tried the upper perch as well ? If yes, did you noticed any ride comfort difference compared to the lower perch ? And if no, do you think that the upper perch compared to the lower may have a big difference in ride comfort ?
I can't go with ground control coilover sleeves cause they are not TUV approved ( german certificate ) needed in my country in order to be cleared by car inspection . So my choice was very limited but i already got my springs and in the next few days i should order a set of Koni yellow that i'll pair with my springs.