The new ftpsync from git seems to work perfectly. Our trace file looks correctly updated, and I see it uses /usr/bin/env to find your bash wherever it might be, which works also. Our ftpsync log closed with these lines, which were missing before:
Oct 22 10:18:02 punk ftpsync[95437]: Latest recorded rsync transfer speed: 917 KB/s Oct 22 10:18:03 punk ftpsync[95437]: Mirrorsync done -- + Brent A. Busby + "We've all heard that a million monkeys + Sr. UNIX Systems Admin + banging on a million typewriters will + University of Chicago + eventually reproduce the entire works of + James Franck Institute + Shakespeare. Now, thanks to the Internet, + Materials Research Ctr + we know this is not true." -Robert Wilensky