Ride quality even worse than expected. Advice welcome.

Cut the bump stops or buy some shorter ones, at that ride height you are using the rubber for suspension.
I have a car with 1.14 bars and 15 inch wheels no sub frame connectors and it rides better than my wife’s 2012 GT 5.0...

Sounding like a consensus is emerging about the bump stops. How much can you safely cut off of them?

Funny that you’d compare it to the 2012 5.0. I have a 2011 5.0 lowered on Eibach springs/Bilstein shocks and it rides way nicer than the Dart!