it's something to do with the angle of the front struts, they need to lean back ever so slightly and inwards just a little to give you self centering

then again, i could be hopelessly worng

i'm sure soeone will be along to tell you what you need to do to make it right soon enough but if it's using the escort rack, if it also using the escort front hub assembly?
it might be down to the positioning of the lower arms or soemthing