Ubuntu is just completely confusing atm. It's a beta, so I can expect that. Generally it works fine for me, except that the themes that works fine in Arch on the same version of GTK3/Unico doesn't seem to work the same way in Ubuntu. If I try to patch my Zukitwo theme to work somewhat better in the new Ubuntu I loose border-radius and some hover effects in the theme on Arch. Are the Ubuntu devs messing with GTK3 by adding their own patches or something? I can't make a universal gtk3 theme if that's the case. Expect an update on Zukitwo and Zukini for other distros around the time when Gnome 3.4 is released. But if Ubuntu stays the same I suppose I need to abandon support for Ubuntu.
Btw, Unity still is pretty bad and not something that I like using. The only thing I like about it is their default design. Gnome looks really amateurish compared to it. Gnome-shell just feels snappier and better. (It also still have one design advantage - anti-aliased rounded window borders.) 
Update: I'm waiting for Gnome 3.4 to be added to ArchLinux stable Extra repo before I update my themes. I don't use Testing repos. It also seems that Ubuntu isn't that confussling any longer. Everything will probably work fine.
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Could you please upload your new themes?
Thanks for your work!
I use Fedora 16_x64, and (in my experience) Zukitwo always looks better on Fedora than on Ubuntu. I haven't analysed it in detail, but I know what you mean, it does seem that Ubuntu do do some "weird" things to GTK3. Strangely, even Zukitwo on Mint 12 looks better than on Ubuntu.
I asked devs to make GTK3 fully CSS and drop the GTK syntax. I want GTK3 pretty much like gnome-shell.css with the same feature set but it's not easy to implement, apparently.
Too bad the Adwaita engine is so amateurish and limited compared to the Unico engine, otherwise I would've used it.
GTK3 supposed to move forward not back and CSS can attract a lot more people, especially web devs, though some of the css syntax in gnome-shell isn't css standing, like the gradient syntax but it's easy nether the less.