It's just not the same...
I love that you continue to improvise on concepts while at the same time keeping your continually beat up core characters, but your animation is getting worse as it gets better. The more you put into the piece, the slower it runs on my computer - and I still have what should be construed as a good internet connection. I certainly don't like running it low quality either.
It takes away from the animation that your animation is so good... Blast you for being excellent at what you do! If you can keep the insane concepts while sizing down on the actual file, it would make this much more fun to watch. Otherwise, I just keep coming back to the original, non-choppy goodness that is the first.
That being said, the idea is still strong, and your sense of humor hasn't kicked yet (though I think 4 still has the best climax, tieing things back to the roots). Screw the plot, damn continuity, and to hell with physics! Madness prevails!