In trying to manage compatibility between a IC2 and Metallurgy 2, a few of us ran into a problem trying to make Dense Copper Plates when only IC2 copper would work (I personally have disabled IC2 copper to keep with M2's balancing scheme, so it's a major stumbling block). One of M2's developers has stated that the compressor recipes don't appear to use the Ore Dictionary, as neither M2 or Forestry copper will compress into the Dense Copper Plates. A fix for more compatibility would be great 
