[Bobcat]

X2 on pretty much everything the others have said . One other "factor" to check is tire circumference . May be splitting hairs , but if you are going to all the trouble to set the car up , do it right . Stagger can introduce some really interesting problems , however , modern radials are pretty good ( I run Avons ), but I still check them .
The boys that did my car set it on a surface plate first , set tire pressures , added weight equal to me in the driver`s seat , set the ride heights and then found the center line of the car . Wheel weights and cross-weights were set next and then last , alignment . Then all weights/diagonals were checked again .
For a street car , I have one diagonal at 50.3% and the other at 49.7% and a front to rear bias of 47.5% / 52.5% with 1/2 tank of fuel , driver`s weight in the car and all fluids in .
Ernie is dead on about tire pressures .... depending on the tire we used , 1 psi was equal to 10 lbs of spring change ... and used as a fine tuning tool at the track.... a tire is just a "black" spring . Took these guys about a day to set the car up.
If you can , find some of the circle track boys who are really serious and have them do it . These boys I went to are dead serious ( Donahue`s old Lola T6 is there ) as is an ex NASCAR Caterpillar Dodge car plus several ex Roush cars . The local alignment shops can leave a lot to be desired .
I can`t believe it`s the same car the way it handles now .