The point you made about KH being really good when its good but how it can turn into a icy mogul fest is my worry. Blacks don't often get groomed and with no park what am i to do if/when we have a dry spell and there is no fresh snow for two weeks.
There is almost always good snow to be found inbounds at KH. True, it can get icy at the bottom of the hill, but there is usually good snow on the upper half.
Maybe I've been lucky, but having skied KH for a while, I've never experienced a day where you couldn't find good snow inbounds.
Obviously I'm a big fan of KH, but basing yourself in Banff is a sure bet. Be sure to check out, KH and Revelstoke though, your unlikely to be disappointed.
Have fun.