I Bounce to Disc my mixes using a Master fader with these inserts: a waves compressor, a Waves L1 Limiter, and finally a Digidesign Dither Plug. Could this be a weakness?
The mix engine used to render a stereo file is always a sore spot, which is why I recommend getting a Masterlink and a great digital cable. Come out of your mix session into the Masterlink at the same sampling rate and then render an audio CD from the Masterlink. Keep your high sampling rate files (CD24) for mastering. The L1 and all those Digiwizgizmos over the stereo buss are all recalculating the signal, and may or may not be helping the sound. I say work a little more at making the mix smoke on its own… just be careful, many guys get carried away with stuff stuff stuff. When my clients bring in their computers for mastering, I spend more time taking off stuff than I do adding another plug-in to this or that….