Dan,

It gets mushy, some notes boom out, and other things.

As the others have told you your room is simply too small for distant
miking. Not only are room resonances causing some notes to boom out, but
reflections off those nearby surfaces also color the sound unfavorably.

See this recent article from EQ magazine that explains these problems in
detail:

www.realtraps.com/art_spaces.htm

--Ethan