I was using Shrine-drawn 20s, but Cyrus (same-class bonus for Garania/Sasha) gave WAY less than Kojuro, for example. Think it wasn't Kerry I used after all, but I know TP units got gypped (Saki and Cyrus are both TP units, maybe they decided those readily available units shouldn't get the boost? Didn't have spare Akanes or Spicas to try it on). Themis didn't seem to give the bonus, but maybe I'm wrong about that, I'd have to double-check.
Hm... considering the ones I KNOW I checked are Cyrus and Saki, both TP units, maybe that's it? TP units and obviously the event plats/golds. Meh, I'll have to re-check when I get home. I was pretty annoyed when I bought Saki dupe for CR/SU and it was normal XP lol.