...when your sure it's right, and up on wheels, pour a puddle of water on flat floor (each side), then roll the tires through it. Compare the track patterns on both sides (front to rear) to find dog-tracking or crabbing. If you have suspension, add all the weight you can (family, friends, neighbors) and roll through the puddles. If something changes, it's time to sit down and THINK HARD!!
I've used this simple test to "kick back" the Hunter rep when he's convinced there's nothing wrong with his installation and calibration. It's pretty hard to argue with the actual rolling tire tracks!