FWIW this thread got me fiddling with the Spectraview settings again.
For my setup, I noticed that a gamma of 2.4, brightness 120 cd/m2 gives me a great eyeball match from screen to print for Epson Premium Luster. On the screen I was "seeing into the shadows" a little too much at gamma 2.2, compared to typical prints
For 120 cd/m2 with gamma 2.4 I get a contrast range of almost 600:1, compared to the maximum 450:1 I could bet with g2.2.
So perhaps for some of the more punchy papers gammas greater than 2.2 should be considered. Of course this all depends on print viewing levels, printer profiles and lots of other stuff, but I'm liking gamma 2.4 for my personal environment.