I've got one of the sorbo handles and channels, but don't particularly like them, the channel is certainly very rigid, but its too bulky for me.
I love the Unger Swivle lock handle and just about any other Channel will do for me, but I think the Ettore brass ones are the best.
For years I haven't really bothered about it, but as I recall, I think the top edge of the channel is fractionally higher than the Unger ones, so it is therefore closer to the edge of the rubber blade in the channel, and even with a very soft rubber, the edge of the rubber doesn't flex or bend quite as much, but it really is only marginal.
Dog earing isn't to hold the rubber in the channel tightly, it actually puts greater pressure on the 'ends' of the channel and rubber, and its this that helps reduce detailing.
To be honest, the more skillful you are, then the less detailing you will have to do.
If you wash to the edges then you will have to do more detailing.
If you only feel comfortable washing right to the edges, then pre-detail using your wet scrim (keep it wrung out though!) A quick whip round and then you should be able to squeegee off the pane without worry of getting runs or needing to 'dry detail'
Ian