To be honest Gordy I wouldn't be the right person. My brush care involves polishing the handle and ensuring the brush is towel dry and hung after use. I haven't combed through any of my Shavemacs ever. If I do see white residue at the base of the knot (unwashed soap) I just wash the brush thoroughly again.
The only important thing to remember with these brushes is:
Do not soak in hot water, that is water too hot or even very hot to the touch. I find it causes the hairs to spread in the knot. Perhaps loosening the glue.
When drying don't mash the knot into the towel just brush the towel as though you are painting lather softly at the tips.
Leave the brush to dry in a well ventilated room without too much moisture. If you can't achieve this, leave some silica packets near the brush.
Simple really, a good brush worth its asking price IMO shouldn't need hours of attention, it should just deliver with relative ease.