After more than a month of dragging tools lights, jacks, chunks of steel, etc etc underneath the house, digging holes big enough to dump a body into, building forms in a confined space, 10 bags of concrete and a couple weeks of cure time later, this is what i've got. If the beam looks a little funny, that's because despite the layers of steel and wood that I had on top of the jack, the beam still compressed a bit.
After I let it down and checked the floor above, i figure i'm still 1/16 " to 1/8" low or so. I might need to put the bottle jack under there again and get some shims (oak?) to put it exactly where I want it.
The next post over is now loose, so i'm probably just going to shim that one since it's only holding floor joists, and not an exterior wall. (thoughts?)