To analysiscut2, I added a few lines that delete early and late hits from chiquita showers. (Hits off by more than 10 microseconds.) With this addition, the filter finds 11 of the 12 showers previously missed. The last shower (06:52:46 on March 01, 2004) still doesn't get found because it is not being classified as a chiquita shower. (It has a Caltech 03 trigger, and non-chiquita sites. Even though the non-chiquita matches are not nearest neighbors and not part of the shower, it meets the definition of a non-chiquita shower. This is probably a fairly rare problem.)
New shower list for March 01, 2004. (All showers which pass the nearest-neighbor cut.)