Since you had a tune it may be that the CEL was automatically blocked by the tune. Maybe not that easy to confirm that they work as they should, and you may leave them to later. One way to exclude them is to just remove the "butterfly" wings and keep the shaft - the car won't detect that they are missing. Search for "TGV Delete" for various methods if you go that far. But that's some additional work to do and not that easy.
The PCV is at least relatively easy to check - it shall allow flow in one direction but not the other. It may be that it's just working halfway, but it's hard to say. Easiest is to remove it, clean it with gasoline and make sure it works as specified. It means work but little cost. Also check all the other ventilation hoses so that they aren't clogged.
The fuel pressure is most likely the fuel pump or filter - but measuring the pressure both during idle and during a pull should give you a good indication of the health. If it was a single injector you should have misfires.
The exhaust system includes a possibly clogged cat. Even if the car consumes just a little oil it may be enough if it's during idle and low power to clog the cat - e.g. from aged valve seals.
Yet another device that can produce bad power is the EGR valve, but not every model has one, and it usually manifests itself as bad idle as well.
Also check the actual ignition timing with a timing light to make sure that it is really correct. What the ECU tells you and what it really is are sometimes two different things, but also make sure that the woodruff key actually is correctly in place and didn't get lost when you changed the crankshaft pulley. (long shot, but stranger things have happened) Be aware that this will make the timing look good with a timing lamp even if it's not.
Since it's at max throttle on a 2.5i you have problem I would exclude the possibility of a vacuum leak - not much influence from that during the conditions you have.
More evil causes belongs to the realm of ground down cams (which should be a new problem not seen here before) causing the valve lift to be lower than normal.
For woodruff key: