I really don't see a point to wearing Jet Seraweels full-time. Macroing in for Magic Fruit/Hammer, sure, though Errant is the same stats for less gil if you're just macroing it in (because it's on so short a time, don't have to worry about the stat penalties on it). But full-time? Just throw on the AF body and your enfeebles will land. You don't need any more than that. Personally, I wear Volunteer's Brais, but before I got those, I used Vendor's Slops.
For reference, here's my current BLU gear (not including hMP gear and MND gear):
Perdu Hanger (used Dissector before I got this)
Demon Slayer (used Ifrit's Blade before I got this)
Fortune Egg in ToAU areas, Jr. Msk. Chakram+1 in conquest areas outside Windy control (Tiphia Sting is pretty nice here too though)
Walahra Turban/Optical Hat (depending on if I need the acc or not)
Chivalrous Chain
Suppanomimi
Brutal Earring
Scorpion Harness or AF, depending on the situation
Light Gauntlets (currently debating which I want to replace these with, Pallas, Tarasque, or save up for Dusk)
Ruby Ring
Rajas Ring
Amemet Mantle (yeah yeah, NQ, stfu >.>)
Potent Belt
Volunteer's Brais
Mithra RSE (until I get my Homam feet; if I wasn't Mithra I'd go with Feral Ledelsens or something I guess... as a Hume though, RSE2 feet are awesome)
I never have accuracy issues, really. Between the Accuracy Bonus job trait, the acc from the gear I mentioned, and 6 sword merits, I don't have to eat sushi really. I usually just use Chiefkabobs if anything.
Martial Anelace is decent for Savage Blade, but does nothing for your spells. It's not really worth it, IMO. I assume you don't have Suppa or Brutal, so Merman's are prolly your best bet. Tatami Shield isn't usable by BLU anyway, so you don't have to worry about that.

When I'm subbing something besides NIN, I use either Genbu's Shield or Astral Aspis, personally.