Are you breaking the MIDI out into channels, or just taking it from the mains? When EZ sets up as a new instrument, go into the EZ mixer and change the MIDI channel for each "mic." Reaper will pick that up on each track and you should be able to treat it on its own.
Also, why you suck at mixing in general...
Get into the forum history for a thread called "Why Do Your Recordings Sound Like Ass." It is epic, and educational. If you don't walk away with it with at least three new tools in your box, read it again.