@2002LX470, I have not figured out the underlying issue yet. So far I have (or have had done):
Set the neutral pressures to spec
Cross balance
Replaced fluid 3x
Replaced all sway bar bushings
Replaced globes with good used
Front shocks bench tested
And most recently replaced the globes with new.
With new globes the ride has improved, but the underlying harshness remains.
The 16 step test is working fine, there isn't one corner that feels more harsh than another.
Monday we are going to try swapping tires that are less stiff than mine to compare. I'm running E load rating. I'm skeptical that this is the issue as I have had these tires since the second day I bought this car, but it is easy to test when there is a spare 100 sitting around.
Failing the tires test, I'm at a bit at a loss. I'm not willing to give up the benefits of the AHC and AVS, but I can now understand the sentiment.
Will update with results from tire test next week.