There should be other ways to obtain the Field notes.

[Mahamon]

Throwing my hat into the "buy field notes with coins" ring. I had been farming Lyon and Dyunbu's on Southern Front for quite awhile before giving up but now they've dangled this hoverbike in my face and I feel like I need to finish now (plus I do actually enjoy the lore). I'm actually considering progging the duels just to get it over with. Would much rather spend my time progging literally anything else but here we are.

Shame. I can't even dodge Red Comet's meteor. I'm just not that good. So I can just grind. OTL

My only guess at the very low drop rate is that the Devs want this content to last months… six months.

My thought exactly. Which is both understandable and infuriating at the same time.