I found the real problem with the kemper is that your stuck with the whole profiled chain. And the same amp and guitar in one persons hands will sound different in another, tone in the hands.
best way around is to find merged/direct profiles from the stl/other commercial profiles. The producers will have a good idea of the sweet spots of the amps and then you can change the cab to suit your hands/ear.
It took me 3 years of being unhappy with the kemper before i found out what worked for me.
For irs try
Ownhammer
York audio
Ml sound lab
Jens Bogren