Datacolor User to User Support Group.

This is very similar to my question (as yet unanswered #4161) 
where I profiled and the results were too dark.
(When a "virtual" gretag color chart was output as test print)

Epson 4880, Ilford Classic Pearl paper.
This was corrected by the "suck it and see" adjustments of brightness and contrast.

Is there some scientific reason for this brightness issue?
Is there an iterative process where we could print out a patch chart using our first profile and use this as a basis for an "adjustment" profile?

BTW I have an Eizo CG242W monitor profiled with Spyder...the "virtual" gretag image is stunningly accurate...almost spooky.

Thanks,
Dave Sainsbury