I kind of like the guitars as they are - it's not the stereotypical HUEG GUTURRR sound. But you didn't ask us if we liked the guitar sound, so let's get back on topic:
If you really want that then you should try a Big Muff and try re-amping the guitar sounds between a few sources with different mic arranges to vary the tone. You'll want 16th note delay on the solos and double tracking. You'll want to compress them more, in general. Some volume and panning automation so that the fills are more in your face.
For micing try some stereo techniques, try setting up stereo amp setups. If you have any cheap T.Bone/Nady Ribbons try something like a blumlein. XY or ORTF if you have some SDC's. Maybe a M/S if you've figure 8 mics! If you've a desk try overdriving the guitars through that.
Why don't you just knock it off with them negative waves?