Mine handles and rides worse when the sway bar is disconnected. I get drag link roll so it drives itself all over the road. Dropping the tire pressure doesn't help me too much, it's rough regardless.
The best solution for me was more weight in the back. When I have a bike rack full of bikes in the trailer hitch or a cargo carrier full of tools for the junkyard, the back end doesn't jump when I hit bumps.
About 95% of people chuckle a bit when they see posts like this, because it's an ongoing struggle everyone has but few have figured out. It's something you eventually get used to, but I had some hope at first.
The rough ride is a combination of the light weight, high ride height, solid axles, leaf spring suspension, aggressive tires, and overall lack of aerodynamics. Those are all things that are difficult to fix, or would hinder "performance."