I'm pretty sure it's also the Behringer monitors. As much as I like the "underdog" companies that provide the average musician with really cheap equipment to get started. It's just that..."equipment to get you started". I personally believe that a speaker design is very difficult to engineer correctly. At least to do so effectively. I would stick with companies that specialize in or have a more thorough background in speaker design. Tannoy makes a great little 8" studio reference monitor for around $179.00 US each. They sound fantastic with the Kemper.
The AmpFactory profiles are actually pretty bright which is likely a lot of the appeal of them compared to so many others. Coincidentally they are from a real recording studio that uses real reference monitors as well. If they are sounding dark it's because you are doing something wrong on your end. Running these profiles through a guitar power amp into a guitar speaker is not going to give you the truest sense of the capabilities available to you. You are basically cutting out a very important part of the modeling/profiling advantage which is to have multiple speaker cabs and amplifiers with different microphones giving you a very versatile and multifaceted venue of sound exploration.