sounds to me like when the rack was installed they didn't properly align the splines when they re-connected the steering arm to the rack....if that were the case, you would be stuck choosing between a straight steering wheel but an alignment that de-centeres the tie-rods in the rack(more pressure pulling to one side, causing your erratic steering issues) OR crooked steering wheel with proper alignment. they might have to drop your rack back down and turn the arm a couple splines and re-attach, then re-align again.....
My majorly huge hand-made Focus RS replica build:
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My RS conversion is For Sale: http://www.focusfanatics.com/forum/vehicles-sale/578185-sale-rs-mk1-conversion-2003-focus-svt.html