Gentlemen, thank you for your responses and I was certainly missing a trick.
Having looked into this a bit further, it turns out to simply be a misunderstanding over TAC with my pre-press guys. They were using FOGRA39 as the output profile and had somehow misunderstood that the maximum TAC was greater than our standard pre-flight fail setting of 310%. They interpreted the higher TAC (and subsequent pre-flight fails) as being caused by the RGB->CMYK conversion not setting the maximum TAC correctly, when in fact they simply had a mismatch between the profile and the preflight limits.
Lukas - I gave them the 300% ECI coated profile as you suggested, this is plugged in and working fine. Given your comment about generic uncoated profiles, would you not recommend using the generic ECI ISO uncoated profile, or is that the "best of a bad bunch"? I think you are suggesting that uncoated papers vary significantly enough that specific profiles should be written for each one to achieve good accuracy. Do I understand you correctly?
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