We had a customer who encountered much the same problem.
          The solution that worked for them was to change from a solid
          round fiducial to a "doughnut" fiducial, with an ID and an
          OD.  This tended to eliminate the doming of solder at the
          top of the round solid fiducial.  I wish that I could supply
          you with more info, but I come from the fab side of boards,
          not assembly, and this situation occurred a few years back.
          Tom Coyle
          Field Services Engineer
          HADCO Corporation
          P.S.: My message is cropped, so that you do not have to read
          all of the other responses once again.

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