On our X - 6s we use B4 hardware (hubs, dogbones) with BK2 axles for the same reasons : have more droop without popping out the dogbone.
They push the dogbone inward something like 3-4mm.
See here :
http://www.2wdrc.com/tech_bk2_axles.html
Dunno if it would fit, but the hubs are the same as on your car.