How are you determining that it is the front rotors that are warped, and not the rear?

A warped rotor at any corner can cause pedal pulsation.

I have not seen any crossdrilled rotors. If they cured your problem, it was probably because they were new.

Good luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles