check your track bar mount and frame area maybe you have cracked the unibody there or need more support. that seams to be a common failure are for xjs with big tires. how well does your track bar align with the drag link is it death wobble or bumpsteer?
what ever was not replaced is where you need to look. do a once over and make sure everything is tight on the new stuff and then move on to interrogating the other joints.
also how old are the tires. try rotating the fronts to the back. i had a tire that was causing a dw i guess one of the belts or something was broken. i aligned it a bunch of times. had NTB align it. changed suspension parts and when i got new tires the dw stopped happening.