I also dislike the Kemper sound. All sounds too distorted in my opinion, the Strat sounds is not as clean as usual but some kind of dirty, like the Clapton guitar sounds, and the Les Paul didn't sounded as rough as usual, just with more distortion.
Before I knew anything about the Kemper, during the first concert in Barcelona I mentioned that to my friends, that the sound was too distorted in my opinion, that he had changed of amps, effects or something, and some days after I heard about the Kemper, and that explained everything.