Doing some testing with 8.940 — seems there is still some movements.  I did several reloads with just the addon and it seemed to never budge.  When I enable Elvui it starts to adjust again.  

    Even manually setting the Elvui scale to .64 doesn’t keep it in place.

    EDIT:  Maybe a workaround?  I set my Elvui scale to .65 and set my CVars, uiscale .65 & useuiscale 1.

    So that they match Elv…  My previous scale was a bit hard to read anyways, so maybe blessing in disguise?