Not sure if I know any "br00t@l" metal bands. I think people list a band as "brutal" as a matter of opinion. If it has crushing heavy riffs and double basses at
Lightning speed, then maybe they consider it brutal.
When you say heavier, I keep thinking of bands like
Cough,
Thou,
Candlemass, and Cathedral... Which are the complete opposite of what you wanted. But if you want to check them out, go ahead. Whatever floats your boat.