Yeah man it has to be a difference between EU and US models. OR your meter is off (please do not think I am trying to point a finger or ANYTHING), but if you are using a i1D2, I would not be surprised. Shoot my i1D2 less than a year old, and I was surprised how much correction it needed when profiled against a known good spectro.
I did re-do my color settings. My math was off the first time. So after doing Color again, the tint didn't need adjustment (well it could have gone a tick to the left, but eh).
With just Color/Tint controls, there is no one can get this much error corrected (well expect for using an external proc. of course).
Now if Red was overly saturated along with green, we could make green error much smaller. But due to the fact that red is actually under saturated at stock, and green is over saturated, we (well at least US Models) are kind of stuck.
But for the price, it is great.
Which patterns are you using BTW (on the AVS disc that is). I assume the window patterns?