Just as a rule of thumb anything faster than 50uS will not make any difference to the sound or speed of the compressor, for all audible frequencies, 50uS or less has effectively a 0 attack time, or in other words, is a brickwall.
The 1176 is fast, almost too fast.
I typically used something along the lines of Rvox (light GR) into desser into cla76 (light GR) going finally into vocal rider. But after reading thread of what you guys are using maybe I'm over doing it too. Although I remember a thread along time ago from catharsis and his vocal chain and he had a lot of compressors too. At least 3 I think. Can't find the thread though.
Edit. As far a EQ I usually first try to go between my 414 or my sm7b to see which suits the vocalist best then play with the impedance switch in the preamp, if all goes well I don't use EQ.