When the alignment shop did the work did they provide you with *before/after* printout?
Off the assembly line there is no adjust at the front for camber as well as caster.
Oem front camber is approx .7 degrees POSITIVE
OEM front caster is approx 2.5 degrees
Front toe OEM is 0 degrees overall
If someone has ovaled the shock tower openings (there's nothing wrong in doing so) more than likely the holes have been opened towards the centre of the chassis to allow a negative direction for camber (not caster) adjustment.
Mild negative camber (by that I mean on the negative side of 0) will make the steering more responsive, a less *dead* feel to the steering, reduce understeer into aggressive corners.
Assuming (& I emphasize assuming) that the front is in spec then I would take the position that the pull to one side could be the rear track being out of adjustment.
If the shop did not have the special little tool (turnbuckle) to adjust the rear lateral bars then they would have an awkward time getting the toe set properly.