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The car definitely sounds like it's running good ones it is running on its own. The odd sounds you're hearing sound quite normal. Pressures can only be determined or specified by your engine builder (IAG). But as mentioned, it seems fine and nothing to worry about at the temps you describe. I would only worry if pressures were VERY different at such a temp, like below 10 psi or above 60 or something maybe. Even still, you would want to verify with IAG what the correct pressure specifications are. They should have this information or at least provide you with some guide.
I have no experience with the level of skill involved in the work you're doing, but with how hard you've been working to find a vacuum leak, I'm still wondering if there's something wrong on the fueling side. Fuel pump has some issues?? Any sensors on the fueling side? The MAF seems to be reading good values, but your STFT is bumpy. At least when it stabilizes. Obviously, prior to that it's not even getting readings, which at this point I have come to admit that it should not be that way (at least not for anywhere near that long).
This definitely seems to be where the issue lies, almost guaranteed. I mean the car struggles and can't idle while the logs are showing no data for STFT/LTFT, while everything else is in order. Then when you stabilize the vehicle and things are running, STFT could still be better and hops around a bit, probably more than it should.
I think if you had a vacuum leak, your problem would be slightly different, and we would see crazier MAF readings or crappy AFR even when you do get it idling on its own. If the AFR was bad enough that it wouldn't want to idle on the initial start, why would it all of a sudden fix itself a bit and start idling pretty decent after you stabilize it? A vacuum leak usually indicates consistent AFR problems. Or if the car can't idle from the start, I don't see how it would adjust itself enough to idle later.
Just the thoughts flowing through my mind...
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