Stop PAMPERING Your Feet if you Want Them TOUGHER!
Not sure what you mean by "liner socks", but one of the worst footwear mistakes a hiker can make is wearing TWO pairs of socks. I would sincerely advise against two pairs of socks, if that is what was advised above. Most seasoned distance hikers and runners would tell you that, or ask yourself after doing a nice ten miler with two layer socks.
I don't know why your feet are not hardening' so to speak. I work in construction, when the economy favors that sort of work.. :). My experience, and you can also ask around on this, is that a tradesman who uses his hands will have rougher hands, developed calluses, etc. I tend to experience soft hands at the beginning of the season, but they get a lot tougher quickly.
I worked with concrete a bit and that has lye, and that would dry me until my hands bleed if I failed to wear gloves. I think that is a dramatic example, but generally, from what I know after decades of running and doing seasonal construction: oily skin is softer than dry skin.
You might benefit from understanding alkaline vs acidity of the skin. You may try to control oiliness of your feet, maybe stop lubricating and moisturizing them.
I see a lot of people here recommending using moisturizers. That is new to me..wow. I would NEVER use a moisturizer, two pairs of socks or any type of rub. I don't have any feet issues after thousands of miles of road and alpine trail running in heat and rain, but my experience is FRICTION KILLS. You want to stop your skin from slipping, sliding, and rubbing back and forth inside your shoe. Those blisters are the result of this friction.
Lubing your feet up and wearing two pairs of socks is just idiotic if you want to eliminate that sort of friction and in effect stop the blisters. If you keep your feet dry, and un-oily, I am willing to bet those feet will toughen up.
Construction workers don't rub lotion on their hands, typically. In fact everyone I know doesn't even own lotion. If they crack and bleed we might use bag balm or something as a spot treatment, but the trick to tougher hands is repeated abuse, not pampering.
Food for thought, take it or leave it.
Hope your running continues and grows.