Changing up the tire and wheel will definitely help with ride comfort. You can also look into a pretty good new suspension set up if you're wanting to upgrade. I've had a lot of individuals look into KW V3's to help with ride comfort on many different makes before. Maybe do some research and see if it may suit your needs. You read up on them below. Good luck!
2008 Porsche 911 Carrera 4S Coupe - Suspension Upgrades & Performance