[Barnsnake]

Stop by Harbor Freight and pick up a cheap 18" laser level. Cut a piece of wood (maybe a 1x2) that is the correct length to fit against the bead portions of your rear wheels. Clamp the level to the edge of the board, put it against your rear wheels and project the laser forward. Measure where the beam hits a tape measure placed against your front wheel hubs or brake rotors (wheels dead straight). Comparing the measurements from each side will tell you whether your thrust angle is down the center between the front wheels.

If the thrust angle is correct, check to see if your rear links are "bound up" against each other. "Bound-up" four-links will cause all manner of handling weirdness. Making sure they are all "free" is critical to proper operation.

As a side note, three degrees down on the pinion is pretty high for a setup with no compliant bushings. If you do need to adjust the rear links, reducing that angle some would probably be a good move. It would also reduce your u-joint angles a little.