Taking a refreshed look at that, the Zanpakuto is over-powered. I can see the Shikai being able to meld into any single various shape while keeping its lethality. Also, any length it could have I would cap at 20 meters. 
The current Shikai is much the level of a Bankai.

My reasoning: he doesn't have to do anything to kill everything. It's the ultimate offense that doesn't need a defense. He can sit back and have the wires lash at everything. Even if anything were to get up to him, he has "perfect" Offense and Defense.
Accepting it the way it is would mean that the wires would need to be able to be repelled with Average Reiryoku (Impressive if all at once) in Shikai and Impressive - Legendary Reiatsu in Bankai depending on the number of wires attacking. Its resilience to Kido should also be similar.
If this was intended, it should probably be added. (and by "probably" I mean "needs to be") ;)

Otherwise, everything is in order and I very much like the character overall. Welcome back ^^