Anyway, I'm a bit disappointed that there doesn't seem to be a solution from Kemper to the latency issue. It feels like I've inflamed a sensitive spot (that spot being Kemper latency), because nobody has made any suggestions on the other issues I have with Kemper in my OP.
Mark, I did make two suggestions. They may not work for you but I recommended that you feed your DAW signal into the Aux-in of the Kemper.
It will not make the latency go away but at least you will hear all signals with the same latency. Which is btw what the Yamaha article is about, NOT the overall total delay from pluck to hearing.
Also, I mentioned that the article itself makes a distinction between headphones and speakers. It may be worth trying that to see if that helps.
The Profiler (say) 4 ms internal latency is something that we - people on the forum - just cannot tell you how to decrease. It is probably the minimum the Kemper engineers can get it down to. (Knowing what I know about digital processing of sound, I am actually very impressed how lot it is.)
You mentioned that you started on a piano - so did I. Piano players have it easy as an "analog" piano has basically no latency. By the time the key bottoms out, the hammer hits the string. (The string to ear distance of course still applies.) The digital world is not quite so nice
Also as you saw in the thread, it is not an issue for most. That being said I understand how frustrating it must be for you if it affects your playing and no one else seems to be even acknowledging that this is a problem.