If you have a Bilstein B12 kit, for a SW, I'd make up some spacers for the bottom of the rear springs to raise them 15mm from the strut spring perch. I think simply making spacers from a fibreglass paste should be strong enough. Just make a few drainage channels in the bottom. That should sort the aerodynamic angle of attack.
As the SW is heavier at the rear, use the holes for the rear ARB closer to the bushes. The JTD has more weight at the front so won't be significantly different from the V6. (the V6 is heavier overall but the JTD has a greater forward weight bias). The handling should be balanced at that as the variable rate rear coil springs should effectively self adjust the handling. As with any kit, the greater the roll angle, the greater the understeer effect. Therefore, if the rear is too loose in the wet or greasy roads, fit the rear ARB links to the outer holes.