Terence I have listened to your clip. I don't think there is much wrong with the raw sound. What is lacking is the processing to give it more heft. I will have a look into it a bit more later on today. Thinking a bit more upon this you really could affect the sound quite considerably sweeping 800khz to find the sound you want. I am not an expert on metal sounds, but a boost at 150khz might also help. Try this in the Studio EQ in the Kemper too.
Also increase the definition in the Amp section and perhaps the Compression as well. Save as a new profile to compare.
I am not a heavy player and there are others here with more knowledge about all things heavy that could help you - perhaps someone here could send you their version of this profile.