Arrow should unilaterally go to BLMs first (at least relative to the 3.x era; not sure how jobs have changed but I bet not THAT much); failing that, MNK or NIN. SAM also has a self-haste, which implies to me that they'd also be a good Arrow target, but I don't have enough data to declare that universally.

Bole is a main tank move, pretty much.

Ewer these days I feel should go to the SCH or SMN if you yourself don't need it as AST. The ACN class as a whole feels pretty gimped from the Aetherflow nerf.

Spire has less value because of better TP consumption and management from melee classes, IMO. Outside of saving it for dungeons when your melee is AOEing, you're mostly better off Royal Roading or Minor Arcanaing it.

Balance goes on your highest DPS, if not AOE'd to the group. If you don't have a parser, SAMs and RDMs are decent targets, as are BLMs and MNKs if the latest parses are indicative of anything. Not sure who takes priority in an AOE scenario, but I guarantee BLMs are never a bad choice there either.

Spear is actually not bad for BRD now IF you can align it with their song cooldowns and stuff. In pugs, either RR/MA it or use it on yourself if you think you'll need Lucid Dreaming/Essential Dignity/Largesse etc. in the next 30 seconds. Spear is usually EASIEST to use on yourself, but I do think BRD can get some good mileage out of it now if you can coordinate with macros or on VOIP.