Are you sure that you're not clipping the input of your audio interface? Even if all levels into and out of the KPA are fine, your audio interface's input gain maybe set too high or you're accidentially using the wrong input.
If you're seeing a clipped waveform in your DAW, does it peak up to 0 dBFS? If yes, the Audio Interface input is clipping, if not, the KPA is clipping.
In case of the audio interface clipping, here are the choices I know:
a) Make sure you're using the DIRECT OUTPUT (Output Source: "Git Analog") from the KPA into a DI/Instrument/Hi-Z input of your audio interface. Adjust the input gain on the audio interface so that the resulting level will be about -18 dBFS.
b) Or use a S/PDIF Connection between the KPA and your audio Interface and you don't have to/can't care about the levels.
c) Set the DIRECT OUTPUT to "Git Studio" and go from the KPA into a line level input on your audio Interface. Again, set input levels correctly.
And I don't know any other way to adjust the KPA's input level other than using the Clean Sens in the input section.