I ordered Bilstein 5100 shocks. I found out for sure that they are a bit softer than Bilstein 4600. For Jeep anyway. I called Bilstein tech support and asked them
I need something slightly firmer and longer (for street handling and off road articulation) than XJ Sensa Trac shocks, but still soft enough for my bad back/comfort.
I hope the 5100 will be soft enough for my bad back. I know they'll handle good and are long enough for articulation.
Another option I just discovered is JK Sensa Trac front shocks.
They'd probably be soft enough and firm enough. They are long enough. The price is right. JK Sensa Trac shocks are a bit firmer (valved for 30" tires, which I have) and longer than XJ Sensa Trac shocks I currently have.
JK rear shocks (valved for coil springs) are probably not good for an XJ (has leaf springs in rear).
My old favorite was XJ OME Comfort shocks, but they are discontinued. My next favorite was XJ OME standard shocks (N35 & N36), but those are also discontinued.
The only XJ shocks OME still offers are Sport shocks, but they are way to harsh.