After some further research & testing, and an answer from Fractal Admin, for the benefit of anyone else that might be interested, here's what I have determined:
1. Preset Names and Song Names are affected by 3 system values: Performance Mode, Bank Size, and Bank Style.
2. The only way to have Song Names display is to use: Perf Mode = SONG (or SET); Bank Size = not zero, Bank Style = NONE.
3. When you use that combination, and you switch to Perf mode = PRESET, the initial display you get when you increment UP/DOWN to access Presets is a BANK (Bank: 1 Presets 001-00x). You then have to actually select a Preset from that bank. THEN the Preset name shows.
Sorry if this is old hat - basic stuff for you Fractal/MFC veterans. It was confusing to me at first. Still not quite sure what Bank Size = 0 is for.
For now, I guess it's just a case of remembering to change BOTH Performance Mode and Bank Style each time I go back and forth between Preset Mode and Set Mode.
If anyone sees anything incorrect here, please jump in.