Pork skins ARE permitted on Induction because pork skins are MEAT.

The reason those bars may be responsible for stalling you is that the carbs you're permitted not to count - the carbs from the sugar alcohols - MAY affect you just as if they were sugar. They do me! If I eat one of those things, I have to count ALL the carbs AND it bumps me out of ketosis. Maltitol affects me JUST like sugar.