Hi icon22. The dotgain information for ISOcoated_v2_eci.icc is included in the icc profile. Ergo, your dotgain is already calculated when you Preview your photos in PShop.
When you print to a non-RIP proofer and use the ICC-based method instead, especially with absolute colorimetric rendering intent, .... the proofer will also simulate both colors, and dotgain of the ISOcoated_v2_eci.icc. You may need to do a little tweaking. Kumbaga eh final polishing na lang. So that takes care of our proofs.
Tapos, once your film and plates are already linearized you will ALSO ....HAVE TO....enter the ISO-defined dotgain values in your RIP. I posted in another thread the ISO values of 10,15,20,30,40,50,60,70,80,85,,90 and 95% tints. But these values are for positive plates. You can PM me if you want the complete values for negative plates.
ISO VALUES:
POSITIVE PLATES: 40% in file = 53% on print (CMY); 56%(K)
NEGATIVE PLATES: 40% in file = 59% on print (CMY); 62%(K)