It may have a weak cylinder. So move on to the next thing to check with that in mind. Don't worry about rebuilding the turbo until you are sure the engine is up to snuff. If the turbo is shot for some reason? Stock turbos come up for sale often cheep. Go through the spring cleaning guidelines. No sense in spending a bunch of money until you know what you got.
I'm wondering, assuming it is a problem with that cylinder, if the engine can just be honed and install fresh rings. Of course there's no way to really know that without taking it apart to see how the cylinders look. Think I'll try to borrow a bore scope, or buy a cheap one, and have a look in that cylinder see if there is any visible signs of abnormal scoring/scratches, or wear on the bore. I'm trying to be optimistic right now and hope that the compression will come up on that cylinder with some miles on the engine to "blow the cob webs out" as they say.
I think the engine was rebuilt at some point, I'd be pretty stoked if I find out it's got billet main caps lol.
If the weather wasn't so gross today I'd go out and hook up the scanmaster and start going through the different functions and adjust the sensors, but I really don't feel like it, it's cold and damp.
I did install the power logger on the ECU and put it back in the car, and fired it up just for a minute. Runs terrible, will idle but doesn't want to rev whatsoever, some smoke out the exhaust (which I suspect is from the turbo). However it does start right up immediately which is encouraging lol.