WT,WT how does your XF ride? My short experience with the WAC is that it is nose heavy already. My thought on tabs would be to adjust for list with people moving around while underway. I noticed my 91 seems to lean to port on the short drive I took.
If you want I will ask more specifics. Im sure he still has them if your still interested.
When you get the needle unstuck you need to load it down with scouts and all their stuff, get someone to follow you so we can see the difference in the ride.