JOhnK and BFUnk are very accurate in their statements. DG pedals have a baked in flavor that you cannot dial out (although you kind of can with the B7K with that blend knob). That is part of the attraction for some, and part of the turn for others obviously. Nothing wrong with that at all. I OTOH love my B7K. I dont think Ill ever play without it again. I use it as a clean preamp and somewhat of a boost and tone shaping/EQ. I can even dial in some dirt from it if I wanted to. The great thing about the B7K is the blend, you can dial in or out as much of the B7K's flavor as you want. I keep my blend around noon, that way I get as a perfect mix of my clean tone and DG bite. Im not associated with DG in any way. I am def a fanboy for sure and I love the pedals I use by them.
It almost sounds like what you need is a good preamp that can perform the things I named above, tone shaping, a little boost, EQ and the possibility to dial some grit into the signal with it. For your type of music I cant imagine what would be better than the B7K. Its aggressive, its punchy, it has a ton of clarity, it will handle your low tuning like a champ and it will help you cut through those pesky metal guitars like hot butta. The B7K is spendy but man, is it worth it. And so much more. To me.