@frogman
Pretty remarkable we are hearing the same subtle differences between arm wands with the VDH. Guess my 73 year old ears aren't as bad as I thought. The focus of individual instruments in space (particularly piano) don't seem quite as sharp with aluminum but I was able to sharpen it with VTA. My setup requires me to listen rather near field and the aluminum wand does push things a little further back in the stage.
I wondered if the VDH case was removable but prior experience prevents me from being that brave. If you recall, removing the case was a tweak many performed on the Lyra Clavis with the warning that removal dangerously exposed the cantilever. I removed my Clavis case and enjoyed the improvement for about a year before snagging a shirt sleeve in the cantilever while dusting the table and sheering it off. Hence, my cowardice.
@pegasus
I have been setting up with small changes to VTF and VTA being conscious of the interrelation. I haven't been quite a meticulous as your tiny blue ball method :) but using very small increments. It certainly improves the setup. I'm finding that, so far, in my setup, the VDH seems to like the high end of recommended VTF range and, like the Delos, almost level VTA.
Thanks to all for tips and observations!
Harry