best leaf springs for smooth ride

I have Afco springs on my Duster. They have a full range of arch's and spring rates. I'm using 20231M's, which have a 121 lb/in rate. Stock V8 leaf springs were in the 110 lb/in range, so they don't ride stiff at all. I have Hotchkis Fox shocks paired up with them though. The Afco's do have a reinforced front section for better wrap control, but its not as aggressive as the SS's and they are the same side to side.

The only thing about them is that they have 1" rear eyes, so you need to use a bushing like Energy Suspensions 2-2117G, which goes from 1" down to the 1/2" A body shackle.