For the past several years I have experienced excellent results curating ID3 tag data in my mp3 audio files using the software “mp3tag”. Here is a link to the main website. The software has an amazing array of tools for editing tags and filenames.
I experience best results with my Clip Sport using ID3 format v2.3
Under Tools -> Options -> Tags -> Mpeg, select Write to ID3v2.3 ISO-8859-1.
Also, I try to make sure the first 8-12 characters of the album, artist and song title fields have the most unique information.
PS: My continuing learning how to enjoy my Clip Sport players comes from reading contributions to the SanDisk forum and from searching topics via Google. The CS user manual is really a minimal starting point.