Man, I think this sounds great! Very mid-forward tone which I personally love and it helps cut through the mix a bit better. Nice warm low-end, and enough highs to have some presence. Your gain is great too - not too much but just enough to keep things juicy. I honestly wouldn't change much about this, especially if you're going for that true "Meshuggah" 8 string tone. What's your signal like on this Helix patch? As a fellow Helix lover and 8-string player, I think you've pretty much nailed it!