at this point, the car is in the realm of the lemon law....you've had it back to the dealer 3+ times for the same issue and it is still unresolved. If they won't swap out your steering rack again, then I'd start the lemon-law process to have ford buy the car back from you and move on.
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