Ouch...that sounds painful!
I train 4-5 times a week and never really get that problem, so maybe it is your mats? or maybe my feet have just toughened up over the years (7 of them).....(thats years not feet
). How long have you been training?
Anyway to get bak to the question...
A while back I did a lot of hill walking and to the beginner, like I was , it was hell on your feet! Really bad blisters all the way!
So I asked the more experienced and they said that if you bathe your feet in white spirit every day over a period of days (weeks?) then the skin on the bottom of your feet gradually starts to thicken and you dont suffer as much
Give it a try....it might help your toes!