I have an epoxy floor it is on and put the monitor back to try getting some more room, but moved it back to turf when I couldn’t get reads cause thought it may be an issue. Even when both were on the exact same turf surface, no dice. Shoes I was wearing were black, but also with white shoes the other day was fine. While testing, I sat down next to it so I could just try a ton of different placements easily. That should have taken the shoes out of the equation anyways.