Do you happen to know the names of any of his other readers?

Not by heart, and my Fritz bios are back at the library by now.

Have turned up some names of more people I knew about but didn't know/hadn't realized they were his readers: La Mettrie (man, *he* should have written some memoirs) from 1748 until his death in 1751, then Abbé de Prades, then after his falling out with Fritz a few years later, Catt. Then Lucchesini. So that takes us through most of his reign. Will keep an eye out for the early 1740s. :D

I'm finding varying dates for Darget as reader, the earliest being 1746-1752, and the latest being 1749-early 1750s. So he may have overlapped with La Mettrie, not sure.

Almost there!