If you care about a smooth ride I'd get rid of your MKI and get a vehicle built after 1995 or so.
Moderator, Is this kind of heresy allowed here? Surely this member needs to be banned for posting such an idea. Probably drives a Buick LaSabre.
I actually no longer have a mkI or any water cooled vw but I advocate for running 45+ psi in your mkI, bracing the hell out of it and putting poly in everywhere including motormounts but not the transmission mount that's too much. I currently drive a tacoma by default as no other manufacturers produce a p/u near compact. I loved my caddy but can't keep up with the required maintenance right now, it's heart is in my garage and will find another mkI engine bay in which to live sooner or later. My family car is a 2010 wrx, ride comfort and compliance are not valued in my household whatsoever.