I personally don't have anything to do with the colour matching on our C6000 presses (other than approving proofs), but I know our production guys have many profiles created for different stocks and calibrate it every morning with the Macbeth One-Eye that's connected to the Fiery RIP server. They also recalibrate if there's a particularly long run where there's one dominant colour throughout the job as it can change the consistency.
The production guys also appear to tear their hair out when the colours need to be matched to a previously printed job. They quite often tweak the colour settings on the RIP to get this sorted.
Designer for Colourgraphic Arts, Bordon, Hampshire, UK