Hi E,
First, I don't have a MS2K or a Mac... so I can not try it myself. But the fact that you got a good dump, makes me think that the other direction (to the synth) should work fine as well.
Further, I can only advice you how I think it should work

.
The MIDI clock setting has no impact on SysEx dumps. At least, for a dump it is not needed at all.
The audition function will dump the selected program (only 1 out of the 128!) into the edit buffer of the synth. This means that if it is ok, you should at least see the patch name updated on the display. Now to really audition is, you need to play something on the keyboard...
When one program is dumped into the edit buffer of the synth, it is not stored. It is just a working copy in memory. So changing the program on the synth itself will load from its flash a program and overwrite the edit buffer again.
Also make sure that when using the audition function, you selected the right MIDI interface and MIDI channel number.
Now when you send the whole SysEx file with the Sysex Librarian, the complete dump will be stored into the flash of the synth, at least if it's write protection is switched off. I think also that the the midi channel must match.
Good luck.