you may have tried this already, but have you switched the front wheels? My car was pulling to the right even after a proper alignment and various components replaced. Switched the fronts over and boom- straight tracking. The car still follows the road camber but I hear this is a normal trait with Merc steering.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys