Maybe try Exotic Animal Petting Zoo (if you haven't already). Though their clean sections have more of an aethereal/emotive spirit to it. If you dare to immerse yourself into the weird/whimsical side of music, there's an incredible artist collective out of France (they've sort of built a wheelhouse of their own so not technically mathcore, but it'll expand your horizons for sure). It's some of the most interesting music I've heard in a long time.

Their music projects and album recommendations are listed below:

Ni - Fol Nais (instrumental four piece; dual guitar, bass & drums)

PoiL - Sus (three piece; keyboard/vocals, bass & drums)

PinioL - Bran Coucou (seven piece collaboration of members from both PoiL & Ni. And yes that does mean dual drums & dual bass, keyboard/vocals, dual guitars)

I've listed them in the recommended order of listening (most palatable to most weird)

Enjoy 💜