The wide cut staggers have been about for a while, but as I don't race 4wd I can't really comment on how they handle, although my guess would be that they fit straight on a 4wd front wheel without any modification.
As for running on the worlds track, I think your post may be better listed in a more generic area of oople as I don't think anyone from NBC will be heading to Japan to race rc in the near future.
While astro, well that's a different subject completely. I can see where it has it's pluses and minuses, but on a wet day I've had more problems with bearings seizing up on an astro track than any other surface, but you don't have to do so much cleaning up of mud and gunk. Like with everything, it's good in moderation is my feeling on it.
I think the worlds will be interesting........
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