Wasn’t too long. Did read.
There are a number of risks in making another post: (i) confusing the OP; (ii) demonstrating how little I know about CM; (iii) revealing how out-of-date I am, not using either HD black, Pro inks or PPT; (iv) being reminded that one has to pay the PPT entry price in order to understand it. That all said, this issue is one that has preoccupied me for a long time, so I’ll plough on.
My (limited) understanding is that ICCs produced by the major commercial software programs contain all the four standard rendering intents, including perceptual and rel col, for both printing and soft-proofing. From what I can see, so do QTR -generated ICCs. Given this, I don’t understand the statement “… found that actual iccs (i1Profiler, etc) are Tristimulus Colorimetric matching”. I can see that the ICCs you posted do darken the image less than the QTR-generated ones. So I’m a little puzzled, and expect to remain so while I don’t have access to PPT.
@Mikemuka - I’ve done an edit to the blog article I linked to above, to simpify it and update it and to mention some of the information in this thread. You may prefer to use PPT, but there are ways to address your problem without it.