I believe the "yahooslurp" does'nt crawl as deep as
googlebot, and fare from frequent visits as GBot -

Still the index contain a lot of old material, dublet's, and "worn-out-shoes" 404 pages.

My own scenario "how to get it right"
I have a site with this URL
http://home6.inet.tele.dk/anton/ - alias
http://www.kimspitstop.dk and in google I rank well with my primær Url + alias, but with Yahoo I can only find the index page www.kimspitstop.dk with webrank 4 and have hard time with the yahooslurp to swallow my intire index + under_pages.
I belive my site is not banned and I use no blackhat technic's, I'm just follow the guidelines.

But anyway good thing's takes time ? huhm :O)
Regard's
KAH