My own feeling is you're better off with no glass particularly on top, I don't use any in my De Vere 5108 for 120 up to 10x8 negs and only a bottom glass in my Dursts for 35mm & 120.
If using glass I prefer plain not anti-newton, I have anti-newton glass for the Durst and felt it knocked the sharpness and resolution.
How do you use your Durst with only one sheet of glass? In other words, how do you hold the negative flat?
The only way I can see that working on my Durst L1000 would be to use the top 1/2 of the metal film holder and replace the bottom 1/2 with the glass.
If I had been present at the creation, I would have given some useful hints for the better arrangement of the Universe.
Alfonso the Wise, 1221-1284