Fiery Ex RIP + 700 = Color Problems?!

[arossetti]

My analyist - who I would like to think is one of the best in the Xerox network when it comes to color tells me to only calibrate on one stock.

[einstein999]

(old topic, but a carry over from another topic, cant find link)
They both use Adobe RIP 3, and during Fiery class, the instructor stated in training he can get same color on fiery or creo, its more a matter of the print engine and its color gamut. (for example KM business class copiers can have IC 412, but having the Fiery does not overcome the fact that the engine is not a production engine, and really is not that great at color to begin with)
Anytime you have "fiery / creo" issues, take a look at your engine first, if your engine is off, there is no amount of Fiery/Creo tweeking that can bring it to a low delta e.