A new rule of thumb for me. Is your tab thick enough?

I've been thinking about replacing my finger tab.  It's never quite fit me comfortably and the leather is too thin/floppy.  My fingers get sore after about 30 minutes of shooting.  I asked the knowledgeable Chris Hill what he recommends, and regarding the thickness of leather, here's the rule of thumb he suggested:

For each 10# of weight on the fingers, 1mm of tab thickness.  20# on the fingers? 2mm thick tab leather.  30# on the fingers?  3mm thick tab leather.  This is a guideline I think I can remember.  Just in case I can't though, at least it's here on the old blog.