Got to be the first time I've heard of foot vibration complaint! Plantar fasciitis maybe? I do have mini foot boards and love them, I can't say I notice any vibration until I scrape on a sharp bend. I have feet issues (plantar fasciitis/corns and some gout) and it doesn't bother me a bit. Now my Boney butt, haven't found a solution yet, Corbin seat didn't work, stock seat didn't work, mustang didn't work. Still need a break about 2 hrs in. I have carpal tunnel and my hands go numb quicker than anything, I'm always resting those, but my feet have never been an issue.
For as the body apart from the spirit is dead, so also faith apart from works is dead (James 2:26) ESV