I used the Plissoft IVORY 22 Synthetic Shaving Brush (22mm knot) for the second time, tonight, and I had a better experience with it than I did the first time. My impression is that the loft spays more when the brush is holding more water. Tonight it was actually holding more water than I had intended, but the lather still turned out all right. It will take some more experimentation to get this brush figured out.
After that, I have two Razorock brushes with 24mm knots and different grades of synthetic fiber.
What kind of shaving brush do you use? Tell us all about it!