I'm finding more and more articles recommending custom rigid orthotics for hot foot. It isn't a heat issue, it is pressure on nerves. I've even seen articles recommending them for Morton's Neuroma.

http://www.cyclingforums.com/articles/a-104.html

Google Andy Pruit, orthotics, hot foot, etc., and you'll find loads of info.

TsPoet - how rigid are those eSoles?