Never used that brand before, however I get a good load from my soaps after a bit of a soak in very hot water.
I fill my shaving bowl and drop my brush in and then fill the soap bowl until the soap is covered. I let these set while I strop.
Drain water from the soap bowl and shake out excess from the brush. I am fidning this give a very creamy pick up offf the soap.

Edit: forgot to add, if the loading starts to feel too dry I just dribble half a teaspoon or so of water straight onto the saop and swirl it in.