Few comments.
1. Haste is not overrated. In many cases (Blitz Ring is not one of them!) simply will allow you to gain TP faster with little loss to acc and/or attack. Homam is very sexy in my opinion for any job that can equip it; however, you do lose out on a good chunk of attack you get from other items for a good amount of accuracy and haste. DRK does get some attack bonus traits, access to many good attack pieces (ranged, earring, neck, etc.) and with two handed weapons, you can eat meat with enough accuracy so they can make up for the loss. Not really directed at OP, but more one of the comments afterwords.
2. PCC is sweet. And by sweet, I mean totally awesome. I leveled DRK this week for a subjob and when I dinged 33 to equip the PCC, it was just amazing the difference in accuracy. Before, it was a swing and a miss quite often, but after, it was a whole new game. I was getting near perfect sushi like accuracy while eatting meat. I'm not going to breath down anyone's neck and tell them to get it, nor will I call you gimp for not getting it, but I will say it's by far and away one of the best items available for any melee. I would highly recommend taking your time to get one and with most of the BCNMs lacking any real money drops, any BC you do will not net much cash so might as well go for something you need. Don't waste your time on Kraken Club BCNM either, it's a shot in the dark at a ton of gil, but unless you need the club or have everything else in the way of money upgrades, it's not worth the 60 seals for a 30k payout.
3. /WAR /THF /SAM and /NIN are all decent choices, each with it's own benefits and losses. If you can afford to, go /SAM for pure damage or possibly WAR pre-seigan(it's seigan right?) levels. /THF is ok, but in my opinion, it's antquated. With most parties being constant fights, one after the other, you will get very little down time to allow SA+TA timers to reset and/or have to wait on TP to stack with them. Just go with another job to relieve that "burden". /NIN is my least favorite for damage, but it also is my favorite as mage. You'll mitigate a large portion of damage dealt to you saving the party from good chunks of down time in process netting more experience. For me, I'd say its a toss up between SAM and NIN, but it depends on how long you plan on holding hate or the mob lives when you get hate.
4. I didn't see it or may have missed it, but do you have a WS set? I'd consider working on a WS set to maximize your damage. At later levels, AF+1, Hecatomb, black cuisses set and various other assorted pieces will be great for that. Not sure about your current level, don't have access to wiki atm, so others may be able to comment more appropriately.
5. Most of your gear choices seem rather good, I would recommend listening to Etch and Tyrath, they know what they're talking about.