These guys have released a lot of EPs, and I think you can hear them progressively perfecting their craft...They don't have the Aesop Rock/Rhymesayers affiliation that Grimace Federation does, but I think they are every bit as good. Their stuff is a bit grittier/darker/'rock' sounding than Grimace I think.

Here's a choice track from an EP they released last year:

https://airishuman.bandcamp.com/track/into-the-cold