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.