Driving comfort/tires/problem

Hello dear community, I would like to ask a question. I drive a V 10 with Hankook VENTUS V12 EVO K110 235/50 R18 101Y XL , which I had on it a few weeks ago, before that were the Dunlop on it. Since I had an original set of aluminum rims from VW (there were some winter tyres on it) I had the Hankook mounted on it. At the beginning nothing was to be felt from the Phaeton glided, then I felt every floor shaft and Rille and it sometimes occurred to me as if I was driving over cobblestone pavers. I then “played” with the air draught and it was a bit better, but never quite gone. 2 weeks ago we went on holiday, suitcase aum full and see there, the whole ride to Lake Garda and back (2000 km) was as it should be, no bumping, or so. Now we are a few days back and the same again. Air pressure up and down probed, it only changes minimally. I get to go ahead but the question is clear from the way to go, but thanks to you?