Mr Holland, wish I had found your article earlier and then I wouldn't have had to work through it myself. I have a 300 win mag with a Kahles MultiZero and experienced the rotational symptoms you talked about
so I made myself a crude sketch and figured out that when cranking for elevation the crosshairs were actually traveling along a divergent line and cause the problem
the reticle moves along line A which would cause you to raise the rifle to point G and when you move the point of aim to center it would actually move the POI to point H and thus along line D. I solved this by slight scope rotation just as you suggest.
That started me thinking about cant and eventually I got the level-level-level and an anti-cant bubble for the scope
What do you think about the EXD device? EXD ENGINEERING VERTICAL RETICLE INSTRUMENT at Brownells
Someone mentioned David Tubbs cants his rifle. That's and understatement!