So the drummer sent you a "stereo" mixdown? I ask because it sounds like a single mic mix to me. Kick is completely gone as well. If he can't send you separate mic tracks, you may want to replace the drums with a better sounding drum VSTi. He plays fine, just sounds terrible.
If you want a more aggressive bass sound, what you did is fine, but I would suggest doing it on a parallel bus, or a copy of the bass, then blend both together. You pretty much killed the "bass" part of the bass.
As Baps alludes to, the mix does sound like it was mixed by a guitar player. Guitars sound great, everything else suffers...
Regards,
Dan