The Kemper-Master doesn't react like a Master on a tube amp.. it's like a master on an mixer. Just pure volume. If you want to increse power amp distortion, you need a profile, which is doing exactly like this.
The point of this is, that you can play a cranked Triple Rectifier at bedroom volume.
Edit: Maybe there could be a second step seperation. So
1. Profiling the whole amp + cab + mic
2. Direct Profile
3. Preamp Profile
Now you could merge 3 with 2 and those with 1. Then you might implement something to push the poweramp section.
I know. I just want it louder but perceive it being more distorted and I don't know why
Same here...its nothing to do with the KPA, in fact the KPA and other digital stuff takes some variation out of the equation ( tube temp, mike placement, type of mike etc).
So you have the same problem?