I actually bought up the field point versions of Adayia's arrows today for testing. Unfortunately I didn't get into the T9 raids tonight, but I was able to take them for a spin in Munzok's. In that zone, at least, with a trouby and a coercer, there was a significant, noticeable increase in my DPS. I took 2nd zonewide (the swashy continues to do insane DPS), with the assassin as 3rd. Note also the swashy has better gear than either of us. I think I've only got one piece of T9 jewelry, and the bow from easy-mode Tox.
The damage difference between these arrows and the titanium arrows is actually larger than that between Ferrite and Titanium, and then there's an extra 5% hit increase. Overall, very nice. I only worry about supply, but even so, we can at least conserve and bust these out for bosses if nothing else, since parses aside, that's where DPS matters.
Here's hoping this is a good sign, I was pretty pleased.