I wonder if the tingling is caused by an accelerated rate of capillary development, due to the abrasiveness of running on asphalt and concrete, as opposed to running over a smoother surface like a well-compacted path, or indoor track. After over a year of pretty consistent BFR, it's never subsided for me, but gets more intense the rougher the surface. Perhaps if I always ran on relatively smooth asphalt or at least over the same consistency of rough surface, it would eventually taper off, kind of like the way a lot of people describe marital relations. Perhaps variation and a certain threshold of stimulus are key to getting one's sole's rocks off. Am I husbanding my feet properly?