I just drove a 85Kw today, and it is definitely smoother, but does not handle anywhere like my car; I am getting used to the firmer ride, but am considering getting 20 inch wheels with some more rubber....
This was going to be my solution to you. I would look to the aftermarket for different wheel solutions that will allow you to adapt the ride quality to your liking. I opted for aftermarket 19s but a half inch wider on the same rubber. This has given me the quality that I was looking for (slightly crisper turn-in, better communication mid-corner, and, oddly enough, a more composed ride). The factory 19s felt too "floaty" and I didn't like the feel when driving harder.