When you edit the properties of MOBI file in MobiPocket Reader I think the info gets stored in the associated .mbp file. The E-Ink machines that support MobiPocket don't allow property editing. They do have .mbp files, and I don't know if they would read the info from a .mbp file if you explicitly copied it from your PC to the device or not.
One fix would be to use mobi2mobi to actually put this info in the PRC/MOBI file. That would be time consuming, but permanent.
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