The whole point of the Liquid profiles is that you can approach them as you would a real amp and adjust the gain and tone controls to get the sound you want - and the response of those controls will be realistic - not just like running an equaliser on a mixing board. Some profile vendors create different versions of HB and SC guitars at every gain level - eg Selah Sounds.
The Kemper has some very powerful parameters in the amp section which alter the response of profiles in profoundly and you can tweak profiles to suit your requirements. Dissatifaction with paid presets is very common on other platforms like the Helix/FAS modelers. The smart money is on customising the settings to suit your playing technique and instrument.
I tend to use single coils a lot with clean to edge of breakup profiles and I run my own FX settings in the post amp slots. I recommend using the Space parameters on the output as well - these really enhance the sound on headphones and create the sort of early reflections that we hear in a room environment. Close miced guitar amps are not realistic sounds in any way if you are comparing them with what you are used to hearing with a real amp in a room or on a stage. You need some room ambience at least and well designed delay and reverb patches can create all sorts of atmospherics to enhance a performance.