Here is a test I did today. I figured due to the nature of the topic you may be interested. You can hear how profiling accuracy degenerates when the power amp is pushed hard. I structured the test in a way to make this comparison easy to follow for the listener. Just use fine monitoring. In the lack of that, of course you may not hear much of a difference.
But the difference does matter to me (I am sure many wont care nonetheless, CK for sure does). I would say the tonal difference translates to quite a big one in feel when the power amp pushed this way. I suspect this happens to quite a few -- profiling an amp at the point where power amp distorts and loosing accuracy because of it (maybe not even realizing that the power stage is clipping).
So this is one thing to watch out for. Finding the stage where the power amp does not confuse kemper is essential to proper profiling. It's not always as simple, amps are not all the same, which is why proper attention is worth it if you wanna get the best out of your profiles. I would encourage only slightly less volume from the amp, a bit less, and less, till you reach the point when profiling works as well as it can (that is if you like tones with power amp higher than 2/10!).
Yes, I know the "dual stages distorting" is "in the manual"; no, I don't have to go read it; no, I don't think kemper sucks, blah blah blah