I also have a small drum room (my entire tracking room is rather small!)--lower ceiling but the room is larger than 10' x 12'. I find that if I can get the drums sounding great with just kick and overheads, that I'm good to go for drum sounds. I agree with others here promoting experimenting--try different positions, particularly with the overheads; closer to cymbals, off to one side slightly (following tom location), over the drummer's shoulder, etc. I have been using Gefell 300's as overheads and find them smoother than some other choices.....hihat has not been a problem either. I also like to have at least one mic out front and compress the snot out of it with something aggressive like a Valley People or Lacey Thompson compressor. Using that track in the mix and time shifting it to my reverb/slap tastes, has brought the "Ringo content" up in my drum sounds as well.