the difference between the left and right will give you your cross SAI.
ex. LF SAI 12.5 RF SAI 10.5
this can cause a pull to the right. most techs dont know how to read anything other than camber, caster and toe(if they can do that) there are many factors that can lead to a vehicle having a pull.
the caster can be PERFECT and if the SAI is out of spec the car MAY have a pull.