It would help if you could describe how the mixes don't translate? Too much low end, no presence, phase issues.
If you could do a simple signal flow diagram including monitoring it would be most helpful.
These are some of the more obvious things I can think of:
* Sonarworks gets recorded on the mix for some reason, do you monitor after the b2 or before?
* Something else is connected over the monitoring channels that doesn't get recorded.
* One cable has it's polarity reversed that gets the signal twice, so it doesn't show up on your listening environment because it gets flipped back when monitoring.