lol you kids and your extreme metal.
Anyway Meshuggah has odd time signatures. Something about the drummer keeping time with his hands (snare, hi-hat, toms) and playing weird time structures with his feet (bass drums). God knows. Dillinger Escape Plan are supposed to be similar but I cannot unfortunately stand such music.
Among experimental metal I have heard Fantomas' album Suspended Animation. I thought it sucked (or maybe I was too stupid to get the experimentation part of it) but you might like it.
Also look out for tech-death hybrid bands like Atheist (founders of jazz-death), Pestilence (in particular their album Spheres), Cynic or Spiral Architect.
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