Hi: Feet are very sensitive, even for sexual practices, ha, ha. I remember that Robert Bruce says something like that in his books. He advices to "taste" the different energy types when you practice in different places, such as: churches, beaches, nature, city, and so on. You are very lucky to have developed such ability. I'm very good in doing feet-energy absorption, but I've not tasted anything special from one place to other. In my case it is more "tactile", and I feel an inner massage which "feels" electrical and expanding. Go on improving that!