Sounds fantastic. I'm not too surprised actually. Kingsley pedals are more "guitar level" than actually guitar level.
This is something I threw together just as a quick n dirty demo. For home recording, I have been using the Constable into a Two Notes CAB direct into the computer (traditional Preamp into Power Amp/Cab Sim). For the hell of it, I tried using the Minstrel alone as a Preamp into the CAB (w/CAB input setting as "Line Level" in instead of Guitar Level) and I am loving it! It doesn't make any sense, because the Minstrel is guitar level out, but I was surprised at how great this combination worked. The EQ range on the Minstrel is so extreme, it is so easy to dial in whatever you are shooting for. For the demo (please don't judge, lol) I tried to show some of the versatility of some different sounds from each section. I have had a problem with other recording direct solutions, because the pick attack and palm muting are usually weird. With the Minstrel, I had absolutely none of these problems and the touch sensitivity and reactivity with the CAB made it extremely fun. I actually ran the bass through the Minstrel/CAB as well. Enjoy!
You have to remember they're still full voltage tube preamps, and they only become guitar level because he optimizes the output stage to feed a guitar amp. If you crank the output, they'll still have plenty of oomph.