This could be a number of things. First I would rule out your monitoring, so check via headphones.
Next check your profiles. Try plenty of them as they can vary wildly.
Most of this is set up as I've never had this issue and there are too many blind tests showing its very comparable. I try not to eq much as the base sound should be good.
I believe that if it doesn't sound good, 95% of that will be you....either your set up, expectation ( I found when going back tot he reference amp, it wasn't as amazing as I'd thought), playing or profiles.
To add: I found the KPa is like any really good amp - its sensitive to variables more so than a cheap amp, hence it will show up deficiencies