A quick Google does show Nitrox advertised in Flores/Komodo. Agreed even I feel fresh and energetic after diving with Nitrox. But I seldom find Nitrox when I ask about it.Yes. Shorter/shallower dives and 3+ dives a day on regular air makes me totally exhausted. I always dive Nitrox when I can and I haven't been anywhere that doesn't offer it yet.
The downcurrents explanation may just be a lame excuse dive shops give but it is the line I hear more often than not.