6GB/s is not typical otherwise Microsoft would have advertised that. On the other hand, they confirmed that 4.8 is conservative, so between 4.8 and 6. The posts you quoted have me saying 6GB/s is possible but I've almost always added that typical is between 4.8-6
Now it's not typical. OK
Conservative based on what? 4.8 GB/s is included with all BCpack crap and general purposes compression, 6 GB/s ( sorry, maybe 6.5 GB/s ) is theoretical max. I think really you need to stop doing this over and over.