So far I'm into stuff like Last Days of Humanity, Lymphatic Phlegm, and Carcass, and I'd like to hear some more stuff like them- pitch shifters, wall of sound, raw production quality. Any good bands to start with?

thid thread will help hopefully
viewtopic.php?f=2&t=115441
Try Cock and ball Torture
Gut (just released a new album)
Rompeprop for some groovy gore grind, maybe that is to your liking.
got more but I believe I mentioned it in the thread also

Bile is a must. They're mentioned in the thread linked above but they're probably one of the first bands you should check out. Very groovy stuff, great sounding pitch-shifted vocals.

If you enjoy Bile then also check out The Day Everything Became Nothing

Bowel Leakage - Harvest of Nauseating Remnants
G.O.D. - Body Horror
Patisserie - Victorial Austrology
Haggus - The Plausibility of Putridity
Take That Vile Fiend - Excreted Brain Matters
Super Fun Happy Slide - The Undislodgable Nugget Scenario
Clogged - s/t

All feature pitchshifted vocals.

Jig-Ai all the way, my man. They got me into goregrind. Lots of good death metal riffs. I tend to prefer their older stuff a bit more.
https://www.youtube.com/watch?v=prFO08Y ... verified=1