If I was having issues making lather then I might consider reducing variables; measuring water volume, weighing soap, etc. I probably wouldn't actually do it, but I might consider it.
But I've never had issues making lather so I just wet the brush and add water as I go.
Bottom line is that I don't believe that consistency in lather, or shaving for that matter, is enhanced or dependent on equations, spread sheets, or formulas. To be honest, I find those lines of thinking to be short sighted, inconclusive, and limiting.
I believe that experiential considerations rule here. It's just soap - add water, stir, done. If I needed a calclator for that then I'd be done.
But I've never had issues making lather so I just wet the brush and add water as I go.
Bottom line is that I don't believe that consistency in lather, or shaving for that matter, is enhanced or dependent on equations, spread sheets, or formulas. To be honest, I find those lines of thinking to be short sighted, inconclusive, and limiting.
I believe that experiential considerations rule here. It's just soap - add water, stir, done. If I needed a calclator for that then I'd be done.