Good luck, The sounds you are looking for don't often happen in real life. To be honest the dual rec just is not that super tight(vht does that better). Really it seems like you are looking for a more produced sound and not a pure amp tone. I would just try useing a big graphic eq or a
sonic maximizer. And if you try the bbe remeber to roll off the highs on the amp some or you will just get sizzle.
Death metal tones just are not very pure.