I understand that the P85D comes with the same sports tuned suspension that was in the original P85+. From reading the forums, it seems that the P85+ transmitted more road irregularities to the passenger compartment compared to the S85. Is this more a function of the 21" wheels or the performance sports suspension on the P85+? I really like the ride quality of the S85 when I test drove it, and I am now struggling to decide between the ordering the 85D or the P85D with 19" wheels. How different is the ride quality going to be from a comfort standpoint between the two if I put 19" wheels on the P85D?