I'm not surprised, mate. Here's what I was going to post earlier:
If you're using a Profile made with a microphone you're relying on the Kemper's clever algorithm to separate the cab from the amp head.
Much better to Profile a head and feed that through your bin; it'll be a different story altogether, brother.
I profiled the Soldano Preamp straight from its Output jack into the Kemper. Did not hear any Sound. It worked suprisingly well when I played that Profile thru the poweramp + guitar cabinet.
bbb