I don’t really understand these posts. It kind of comes off as though you’ve missed the point of the unit and that you’re not using the technology to it’s intended purpose. The shortcomings you’ve outlined are more to do with your approach than the Kemper.
Most of what you’ve said actually points to the fact that you haven’t liked the profiles you’ve been trying. If you had real life amp sounds that you liked the sound of, then why not profile these? You could capture these at any volume and EQ setting which would have allowed you to get the sweet spot you needed.
The other point about the Kemper being hard to use in a recording situation with the band present etc. just comes down to poor planning. If you haven’t found a sound you like, doing it in an attended session is barely going to help.