I like the video
I terms of your comments on distortion and low tuning I will say this:
I like Eb standard (early Slayer), D standard (my own band, Doom, various others), and C# standard (mid '70s Black Sabbath). C standard (Autopsy, Entombed) is good for death metal, and I quite like the B tuning that Gronibard uses, but myself I would never write songs in those tunings. As you can see though as you go lower you are getting more and more specialized.
Most heavy metal bands of the '80s (Celtic Frost, Metallica, Destruction, Judas Priest, even Pantera) used standard tuning and sounded very heavy with it.