I could not leave it alone & trimmed another 1/8" off the high side spacer...and cranked some more preload into the rear shocks...and it is getting better. Just goes to show that the harshness that I was incorrectly attributing to the rear was in the front all along...

Tracking info says that my spacers are now in-country, & I hope to have them soon. Less preload on the front & a little more in the rear & it should be closing in on optimum.