Dead Heart Guitar Tone = Kiss my fucking ass
Pathetic.
Heaviness isn't how thick or low your strings are tuned. One of the heaviest albums ever is Metallica's ...And justice for all, and that's played in standard E tuning on a six string guitar.
Your minds are conditioned to beleive this false statement about "7 strings = heavy". It is infact, only true that 7 strings equal low tuning, hence more bass in the mix, and an overall muddy sound (In the case of Dead Heart, the mix is so squashed that it isn't muddy, but in fact the opposite, boomy).
That does not equate to "Heavy".
The heaviest Nevermore? The start of Optimist or Pessimist, or the 5/8 section of 42147, now THEY are fucking heavy riffs.