It's the newer Toner, lower melt point and smaller particles which gives it higher resolution ability and a faster print speed, but with that you lose Gloss and can't run its output through older devices without a Post fuser inserter. (Try running the output from the Versant as an insert from tray 5 on something like the DCP 700 and it will melt the toner on the insert.)
You can create a custom paper profile and increase the fuser temp, but output is not guaranteed and may not get the desired results either. YMMV.
Correct, both the 80 and the 180 use a newer toner that do not have the gloss option.
In fact the toner is designed to intentionally give a flat finish.
I don't know how long you have been in the business, but I have been for a while, and the oil that was added to prints back in the DocuColor 12 was the peak of toner based printing in my mind. While the machines after it (DocuColor 250) had double the DPI and vastly better color, nobody has ever really (in my mind) matched the "Finish".
I consulted an Engineer, who told me (I have not tested this, I don't have a Versant) that the closest you will achieve is to change the stock attributes to Cast Coated which will slow the print to provide more Dwell time in the Fuser, which in turn may provide a slightly higher Gloss, with the obvious caveat that the job will take longer.