Get the belt. You'll have 2 more weeks of drops to look forward to getting one of the two items you need, plus the belt is a drastic gain over the Lore, whereas the Midan Bracelet isn't really significantly better than Lore without other pieces to compliment it.

PLUS. Belt is Vitality. Vitality is ++++++++++++ compared to any gains in secondaries for Midas.


As far as suggestions are concerned:
1. You're using a lot of g5's in slots where g4's are more efficient. Anything 230 will lose its materia when it upgrades to 240.
2. You have a LOT of accuracy - you need 699 for A8S and, assuming you've had 4 kills of A5S, you're definitely not progressing on that fight. If you're on A6, you don't need much more than 680 or so, so you're focusing quite a bit too heavily on Accuracy.
3. Upgrading to the Midan Belt and Primal Bracelets floors the shit out of your Accuracy because you've done a lot of silly melds (DET V's EVERYWHERE where you could be melding Accuracy instead to run 0 ACC pieces with Crit on them for more overall gains).

Personally, what I would do is aim for the Midan Belt asap and buy the Primal Earrings when you get it. Those two pieces together will keep your SKS where it needs to be and, if you drop some DET melds for ACC melds, you'll also get a much larger overall gain. Melding 1 Acc 4 into the ears and 2 into the head would bump you up a solid ~10-12 points of stat weight and drop to 689 ACC which should be enough for even A7S progression, by which point you should be hopefully sitting on some Midan Gloves or Midan Boots - both of which make the whole situation significantly more manageable.