Hello
I see the point, the ride is still "firm". Porsche had softer and slight higher combinations on special costumer request but they will not perform like people would like to have a Sportscar ( To much roll ).
Be sure Porsche has testet the worst roads from the worlds in natury and in copy on hydropulsing machines.
I had the oportuntiy to drive several Porsche in the new german regions and be assured they had been as worse as yours ( Can´t beleive any of the US states could have worser streets then GDR or the CCCP, who somtimes where just untouched prewar streets ( maybe WW1 ) ).
The 964 will have a better ride if you drive faster
then it will jump from pothole to pothole like a eleven dancer.
A luxorysedan has much more wheelbase and a comfort orientatet supension wich does also is more remote.
Grüsse