Yes, the low/boomy rumble went away. The Contis were simply loud when driving over uneven roads in a bizzare way I had not experienced with other ties in the past. Bumps are still a bit harsh from the stiff suspension, but honestly not much different than my previous BMWs with runflats.
So many different threads, but I didn't mention on this one that I also had installed the RPM sound reduction kit about a month after my new tires. It also helped for sure, but with wind noise more than anything, not really road noise. And even then, the biggest improvement in wind noise reduction was the SC replacing my windshield and roof glass because of a factory defect in the windshield and the roof glass misaligned from the factory. Barely hear any wind noise at this point, even if considerably windy outside.