Your master track is set to multichannel? I think this is what you said, but just checking...
Also, on the Audio tab for the QT export, did you change channels from Stereo to 4 Channels?
Forgot the tab in the QT export, got it to work, but it gave me 4 mono channels when I re imported, I'm looking for it to be audio channel 1 a stereo pair and audio channel 2 a stereo pair.
I don't think you can do this with the implementation of QT in Pr, unfortunately. Multichannel export pretty much implies multi-mono.
What you may be able to do is export the QT with just channels 1 and 2 to a stereo output track, and then export 3 and 4 as a separate PCM file. QT Pro or similar may let you then copy the 3/4 stereo into the QT, so you'd have two stereo tracks. QT is fairly flexible in many respects, but I don't know if this is possible or not.