I see you did your testing with German steel. I wonder how your results might have differed if you had tested Sheffield steel or others types.
Your testing does show the trade-off between keenness of the edge and smoothness on the face. That is why so many of us pick different finishing hones as our favorites. If we could get a super keen yet super smooth edge, most of us would be satisfied, but that rarely happens. Normally, we have to find the stone and technique that produces an edge that is keen enough for our beard type and hope the edge is smooth enough for our face. Or conversely, we will try to produce a smooth edge and hope it is keen enough for our beard. For those with coarse beards and sensitive faces, there is not much tolerance either way. There is no one stone or one method that works for everyone.