I leveled NIN not all that long ago, I did it decently, but knowing what I know now, I could have done better in some places. First off, screw stacking evasion for the most part, you have a BRD so you should be getting haste from the healer, march and minuet or madrigal all the time with elegy on the mob. Your timers should be low and the mob should attack rather slowly even without slow although you can use it if you need. However, at your level using too many enfeebles is not worth it hate wise, in the same amount of time, you can pull more hate with melee damage so use sparingly, probably best if you're doing pulling which I doubt.
Second, stack on haste and accuracy with everything else using DD pieces. I think Tymon's setup a couple of posts back looked rather nice and similar to my own. Your only options for haste are Fumas and Swift Belt (speed if you're loaded) which are both very decent choices, but do not bother with the 2% haste belt, it's not. For accuracy, use dual snipers, pcc, and jujitsu gi. Rajas is a nice alternative, but sniper gives more acc. After that, it's basically load on +attack pieces.
A good setup should probably look something like this:
TP:
Ranged: Bailathorn
Head: Voyager's Sallet
Neck: PCC
Earring: evasion or attack earrings, preference
Rings: Snipers x2
Hands: O.Kote
Body: jujitsu Gi
Back: Bat Cape or similar, attack pieces are meh until amemit, lvl 61
Waist: Swift or Life Belt until you get swift
Legs: Not much, no DD pieces I can think of until level 55
Feet: Fumas
WS:
Earrings: Attack earrings
Rings: Rajas/STR ring
Waist: Potent seems decent, never used
Feet: Federation Kyahans or RSE, whichever is better.
You can use AF body for TP, it gives the same delay reduction as a Suppa, 5%, but you lose out on a lot of accuracy which more than likely you'll really need.
Now, as for keeping solid hate, it'll never happen unless your DDs are gimp or holding back, neither of which will be beneficial for your experience/hour. In that case, the best way is to either sub NIN or something suitable enough to negate enough damage to not be a burden. I assume you'll just be doing TP burns so spam WS whenever you get TP to keep hate, Retsu is a great WS and Chi is also good. I preferred Retsu only in part to the additional Paralyze effect even if Chi is slightly better in damage. Keep Berserk up whenever you can, it's the best for damage increase.
The only downside I have to the two handed update, I think it was a blessing and a curse. The damage increase I can fully understand, it was entirely warranted to bring those class of weapons up to par, but the accuracy increase, I find very vexing. The reason I say this is because two handers don't need sushi while NIN does and with a BRD, the issue of madrigal versus minuet is quite annoying. You'll be fighting colibri soon and you won't be using sushi for those (use mithkabobs, their cheap and you'll spend less than sushi normally) so accuracy will be an issue for you, but not 2 handers. If you can, get Madrigal on colibri, it'll help you keep hate far more than Minuet will.
I think that's mostly it, anything else I think should be obvious enough or has been covered.
Edit: I totally forgot about Luisant set, it was around when I leveled NIN, but it was super expensive. I never bothered with any of it, but some seem like decent WS pieces if not full time until you can get Royal Knights.
