As per alog 21036, Evan dropped the absurd precision in the WFS_offset_* scripts which set the dark offsets.  I reran it now since the IFO is down, confirmed that none of the 80 offsets changed by very much, and then accepted them in SDF.  Now at only 4 sig didgits, SDF was able to write them into the SAFE.snap when I hit ACCEPT all.