Post-BB Dual Blade build

Nah, avoid doesn't do anything to even thieves in the current state of GMS. Even with thousands of avoid, I still get hit, say 90% of the time at late 14x. Anywhere. I only have nimble maxed because I was already in 3rd job when we got the free full SP resets, and it's not like triple stab would've been any better.
By the looks of it, Chaos will give us the dodge rate back though. Looking forward to that.

If you have thousands of avoid, you have at least a 25% avoid rate on monsters your level.

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.

It gives a passive dodge multiplier like Evasion Boost does. You won't see it in your stat screen. If you have 30% chance to dodge with your current Avoid stat, then you have 37.5% total chance to dodge with maxed Mirrored Target.