After comparing notes with my guild mates, it seems like the “extreme” level on the flash quests yields fewer rewards than the “hard” level. For example, when I ran today’s repair kit flash quest on “extreme,” I got 6 repair kits for my Polonia crew (RM slot gave loot instead of repair kits) and 9 repair kits for my other two teams (6 for the standard reward and 3 for RM - I think my champs were Hemma and Lilu). My guildmate, however, got 15 repair kits running Lilu on the “hard” level.
Eireann#42112, iOS 16.3.1 (iPhone 12) and Epic (Windows 11 and Windows 10)