This is how I felt about the samples I heard as well - I thought it may just be my ears being used to the brightness of the EZDrummer samples. Ages ago on HCAF I mentioned that I thought they sounded a bit dead and boring and they were like "d00d3 that's just because they're not in a mix" and I fell for it
regarding reaper doing multiple outputs, I have no idea how to do that

I just put ezdrummer on a single track and do all my drum mixing with the built in mixer. And change the snare to the 13" since the other two sound a bit dead to me.