Coronach>Barrage>Coronach
tends to help.
This. If you get a relic proc, chances are it will turn... there's nothing really you can do. Just turn away and run to the tank. Sometimes you can get a relic proc w/o pulling hate, which is always nice... I don't go out of m way to use -enmity in barrage set fwiw.
As for the above set: I'd only use Iuitl hands especially for preshot. Arcadian Bracers +1 instead. Nahtirah Trousers over Arcadian Braccae +1. Arcadian Socks +1 over Orion Socks +1 unless you need acc, and grab an Elanid Belt rather than Scout's.
Personally I don't bother with Hurlbat. I use Atoyac (OaT + WSD+) and Aphotic (Path A) offhand if I'm /NIN.
edit: Also use a Leafkin Shield. Hidden effect: Win all the parses