You're putting the compressed stereo pair in the rears and the parallel uncompressed stereo pair in the front?
The compressed pair will be where the sound seems to originate from... Is this intentionally something placed in the rear in surround?
I had a recent recording of a saxophone duo that I recorded in simple close stereo with two TLM-193 mics. I've been making surround mixes along with stereo from the recordings I've been making at this club. So for this one I put the compression bus I dialed up for that pair in the fronts and then the uncompressed parallel bus in the rears for a quad surround mix.
Everything can't be perfectly discrete... Sounds right.