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I used to use really thin socks, but my foot seemed to rubb more in the boots (because it moved around more) and cause sore spots. I now wear a medium weight sock, not a thick one, and practically never have problems.
I don't think your shinbang really has anything to do with the socks - perhaps now you are tightening your boots more than you used to in order to keep your heel from slipping without noticing that you're doing it? If you are using a really thivk sock now I would try a medium thick one and see if that doesn't help.