When I say "soaking the brush less" I am referring to the depth of water, not the time... The soak lasts 5+ minutes (depending on the length of my shower, etc) but you are correct I'm typically soaking less than 1/5th of the total loft of the brush. It seems to have worked fine with all my other brushes, capillary action seems to draw plenty of water into the knot. In addition to a 5+ minute soak at 1/2 loft depth, perhaps I should also try a quick total soak.
They look split to me, compared to my Omega brushes in particular. But perhaps I should do some test lathers, soak cycles, and towel scrubs to encourage the blooming/splitting process.
Hmm. It all sounds right! I soak badgers the same as you do, maybe the bottom 1/4th or so, but I've gotten in the habit of soaking more of the knot on boars. That could be jim and @Tanuki's influence