Thanks for the interest and thoughts (Heinz and JohnHarris) and compliment (AMorgan).
The (slightly) harder ride is (I think) due to: slightly stiffer springs at the front of the Super sport. I have been given the understanding that my Plus Six (2025) has a spring rate of 35 N/mm at the front whereas the Super Sport has 40 N/mm. At the rear, spring rates remained the same at 35 N/mm. I understood that the coil overs from Nitron use the same spring rate as original. I think that I noticed the effect of the Nitron dampers. As such the Super Sort has more vertical wheel travel as compared to the Plus Six. The Super Sport, I drove has more rubber (compared to my Plus Six) i.e. front 235/40R19 vs 235/35R19 (in my P6) and at the rear 255/40R19 vs 255/35R19. Hence, I conclude that the slightly harsher ride must be due to the Nitron-dampers and slightly higher spring rate at the front.
Something I forgot to mention earlier, is that the steering of the Super Sport felt more direct (less turning of the steering wheel is required for rounding the same corner). This I found an improvement, particularly on round abouts.
