Brief follow up:
Replaced all of the valve stem seals, the old new ones were brown (didn't find part numbers) and my replacements are black (Ishino Stone). When I held the brown one side by side to the black one, the inner diameter of the top opening was definitely smaller on the black, but it could just be because it hadn't been worn in yet. As I popped the brown ones off, they still snugly rode up the valve and caught the lip of the valve stem. I did notice a under a few of the valve stem seals, small pieces of what appeared to be old carbon build up or sludge were on the valve or guide. I forgot to bring my micrometer to measure the side-to-side play, but it seemed minimal, to the point that I couldn't see it preventing a new stem seal from doing it's job. I understand that concrete numbers and measurements trump how I feel about it, but I can go back in and measure it some other time if I need to.
So the new seals are in, still smokes, though it does seem to be a little better at idle...but probably just my imagination. Friday evening I pulled all the plugs and have had ATF soaking on every piston. Today I rotated the crankshaft a couple times, and I'll mess with it after christmas break. I remember when I first opened up the engine, it had a bit more sludge and oil buildup than I care to see. So there's a chance the oil rings have too much buildup to do their jobs, but again, the oil consumption was a recent development so I didn't think rings would be an issue.
I also "rebuilt" the lifters as per cygnus's write up. This should be a mandatory service with anyone that has a p90a head; lots of nasty gunk built up inside of there. I had been reading that these lifters can have a tendency to over pump, so to speak, and it made me wonder if that was the reason for the initial intermittent loss of compression while cranking.
I'll keep this thread updated, until then, Merry Christmas to you guys!