Post-BB Dual Blade build

Just a few suggestions. You didn't mention anywhere about maxing nimble body. I believe the skill is much more useful post bb and will actually help you out down the road if you get some %avoid. I recommend maxing nimble instead of putting points in double stab/triple stab/fb, I did just fine with 1 double stab. It is not hard at all to level to 30 with just 1 point in double stab, and once you get to 30 you will never use it again.

Also, IMO (as well as many others) maxing CoH is pretty useless because it gets outdamaged by Upper Stab (maybe not the case when its max coh vs max US, but it's not worth spending 30 points to just get a small damage increase). The only useful thing that comes out of it is iframes, in which case 1 point is enough. Also, you might want to consider pumping up MW somewhere in 4th job, I suggest sometime after or during when you max final cut. After final cut and thorns is maxed, I actually think maxing mirror target is the best way to go. DBs are somewhat squishy (especially with constant use of final cut) and generally the only way around this is their amazing alacrity and avoidance. With mirror target, you get a big boost to DEF and passive dodge, which is amazing.

Keep in mind this is only a temporary build because once chaos comes out, it will change almost entirely in 4th job.

There's a lot of free room in what I wrote, and the extra points listed would probably go into nimble body. My point is that with the extra points, it doesn't matter what you do with them. Nimble body is useless (even more so), with the redundancy of accuracy and severe nerf of avoid after BB.

In regards to fourth job, it doesn't really matter what you do after maxing final cut, with the nerfs to thorns and chains. I listed thorns after final cut as a small damage boost that can also help your party, and won't come up as often as MW in parties. Chains makes you more versatile. Maxing it makes it practical to use as DPS, and not just something you would use in dojo. Chains has i-frames which can also act as a sort of stance. It also doesn't KB (more like a stun-KB) so it helps at Pap where you can take advantage of the top platforms and not get stunned/dispelled. MW would be a good idea to put points into sometime after final cut, but I preferred thorns and chains before for the reasons stated.

I made a thread a while ago to figure out what mirrored target does: http://www.southperry.net/showthread.php?t=36273

Other than its use as a puppet, it doesn't do anything other than give (arguably neglectable) passive defence. It does not give passive avoid to your character.