Oh boy, yeah you weren't kidding. This is OP as sh*t.
It can definitely be worked with, but I'll have to pair it down quite a bit. I don't want to rag on it, but I'd like to give you some design notes.
You got a lot going on here, but I won't blame yah since as you said, it's been a while. Mainly, it just blows away the design rules of zonpakuto. (Yeah, there are design rules).
Basically, a shikai should only have two gimmicks max, the first being the shape it takes on, and the second being the actual power. You've got like, five? You're transformation is also way loco.
I don't even know where to start with the bankai. But it's best to remember that bankais are only the natural result of amping up the shikai abilities. It never invents new abilities out of whole cloth. (Looking at you, exploding clones). A few knew things may be incorporated, but they're always tangential shifts into something closely related. (Like Byakuya forming all his little blades into normal swords)
Honestly, it's all more like the Quincy power ups from the last arc than anything else. (Which I don't think you read?) In either case, as I've said before, I'm not likely to introduce any other new faces soon, so feel free to think on it and make adjustments. Remember: a good zonpakuto comes from its simplicity of understanding