TW percentage seems a little low. If you have a chance to get the three axle weights again, can you also get the weights with just the trailer tongue on ball?
I would restore more front axle weight, target 100% restoration. Add another washer or two. When you do that, you may need to lower the ball mount one set of holes.
My WDH is very picky about being set up correctly. THe same vehicle can feel scary at 55mph or rock solid at 75mph just varying the WDH adjustment. My TT also tows well behind my friends's 1-ton with no WD, so the trailer itself is stable.
