Is it normal with this brush that when you apply the lather to your face it just splays into two halves or clumps? I find i cant really use circular motions but have to paint it on.
I hope this makes sense, if not i'll try and get some photos
I do the same thing with my BK4. I find that works the best with that brush. As long as you're getting good coverage, and a slick surface, IMHO that's all that's needed.
I face lather exclusively, and regularly use a BK4. I start out with circular motions for about 45 seconds, and once the lather is on my face, I use a painting motion for about 30 seconds to even out the lather.
As for splaying, the Kent splays more easily than my other two brushes in regular rotation, Shavemac in finest (23knot/50loft) and Commodore X1, but my Kent does not splay like your brush. The hair fans out, splays, making an even circle.
Your brush may be too wet, which may may causing it to splay in clumps rather than evenly fanning out.
There was an excellent review here about a year ago on the BK4. The consensus was that it was an excellent brush for face lathering and should not be be delegated only to the bowl.