After more cries from tester guru, I went in and assessed alignment again. Things checked: UIM Blade ECDs - not touching. All Blade tip screws - not touching heads, or tips. R0 Side BOSEM - still crooked, so, I looked over the squareness of the tablecloth - it was a bit out of shape based on the relative planes of the ECD faces to the plane of the table cloth plates. So, a bit of knocking around the table cloth, another round of all 12 BOSEM realignment, and it looks more square to me, with the R0 side BOSEM less crooked. I am running a round of diagonalization, but with no luck - not sure the drives are working or something...