No potato.
I think it’s exactly what you said. I was taking about 2-3 oz samples every day. I shook the keg then took a sample immediately not realizing that the beer in the line wasn’t mixed with the rest of the keg so it was still very salty. Now it tastes great and there is just a very subtle hint. I’m glad my calculation from test dosing beers wasn’t wrong. It didn’t make sense.