Volvo V40 suspension unfortunately much too hard! Help!

Hello dear Volvo driver! I bought this year in late summer a Volvo V40 D2 Momentum Mj.17 Geartronic with the normal chassis. During the test drive much to me that the V40 was quite tight however the roads there were very good and I did not feel it particularly unpleasant. Now after 4000 kilometers driven and mostly highway bothers me unfortunately very much. It is a super car in itself but this bone hard chassis spoils the fun of the Volvo completely. I drive it with 17 inch rims 205/50 tires. About a month after the purchase I have checked the tire air pressure with the hope that this was too high. Forgive since it was even only 1.8 bar! As he now drives with 2,3 bar I would not have bought it in life. To a Volvo (I already had two) V70 Bj. 1997 as well as S60 Bj. In 2002 I will probably be very happy about the ride, but I will not be happy about it.