Donder,
Dunno what model F.27 you're thinking about (although the 20,410 kgs BRW sounds very much like the -500 as what Ansett called "Mk.2's" were 19,731 kgs) but your figures sound very much like what Fokker's glossy brochure claimed.
I doubt I ever saw anything above 220 KTAS on a good day, and there's no way you'd get to FL 195 (even with the post-1982 climb thrust) unless it was a ferry.
Again this is from distant memory (frightening that I remember the 19,731 figure though) and I flew mainly the Mk.2 although did some time in the -500...