Hmm, I have never heard of a reduction in unsprung weight causing the suspension to become more harsh. I also can't think of any reason it would do so. If you keep the same tire but install a wheel that weighs 50% less the "comfort" should not change.I am not too proud to revise my impression, and that the M3P may not be too heavy to handle well, despite the fact that it feels anything but nimble.
In this context the issue of wheel weight and suspension work comes up a lot on this forum.
So, please correct me if I am wrong, but if I shave off, say, 50% of the wheel weight by replacing the Uberturbines (uber-heavy, for sure) without re-tuning the suspension for the lesser unsprung weight it now works against, the ride will become harder, unpleasant for daily driving on shitty U.S. roads, and possibly bone rattling. No?