[ECI-EN] ISOCoated.icc versus ISO 12647-2:2004 Paper Type 1 (WB) Overprint Values

Hello all, I compared colours of the overprints specified by ISO 12647-2:2004 (WB) and the Lab values I read on 100/100 samples which I had transferred from CMYK to Lab using abs col method and ACE in Photoshop CS and ISOCoated.icc profile. There were quite high DEs. C+M DE=10, M+Y DE=7.3, C+Y DE=5.2 May be this method of acquiring Lab values isn't too correct. Regardless the results surprised me, and I don't think it's only due to the way I got the numbers. An old Matchprint laminate proof I examined (using same method, I have its ICC profile) conforms to the values specified in the standard better than ISOCoated.icc profile :-( When I compare the samples using DEcmc, the results are more acceptable. But there are questions: is it OK if colour differences (DE, not cmc) are so high in this profile? Why this? Why data which, I think, couldn't too conform to the standard were used? Will be there more accurate generic profile with such a support as ISOCoated.icc has got? I'm novice in this field. (In writing in English too, I am sorry.) Please excuse me whether what I wrote is nonsense. But I want to know, where the truth is. I though the today best practise is using ISOCoated.icc. However, if the colour differences are so high, it would be better to use another profile. Wouldn't be? Regards, Petr Petr Lozan, Student - Higher Graphic School Prague, Czech Republic petr.lozan(a)volny.cz