I have had the same issue ever since my VX faught a wall, and the wall won. All new front end, including a new steering box. Tried the box adjustment and it did little to help. I may actually have some permanent damage somewhere since I tried everything and nothing seems to work. I have just since gotten used to the loose steering. Gets a little scary at highway speeds and calls for 100% of my driving attention.
I am running 285x60 rubbers on 18x8.5 wheels and was cpnsidering downsizing to perhaps a 16 or 17 with slightly smaller rubbers since this appeared to work on my Rodeo, as it had a similar issue. Tried everything else already and winter is coming up, so I will be driving it more.