Yeah I would suggest soaking your feet for a couple weeks to get your soles down to thier original layer, maybe look into getting some kind of foot scrub thing. I seen them on tv, or you can get exfoliating bar soap from well.ca which is specifically meant for hard sole feet. This should help you, I know what you mean it seems scabies can build layers of skin or hide under the most thick spots on your body.

Your hands and your soles of your feet are the worst and hardest place to get scabies and rid of scabies. That was 90% of my battle my skin was so thick that it allowed the scabies to thrive in those areas, these places are likely where alot of people get reinfected, this is why they want you to wear gloves during treatment likely. It helps to use a footbath and really keep your nails trim.