The one thing that I think hasn't been explicitly stated above is that each judge team gets its own flight summary sheet. It only lists the scores given to the beers that that team judged. The top beers from that sheet are the ones that are selected by that team to advance to Mini-BOS. The queued part only comes in when assigning the beers to that sheet. Otherwise, its identical to non-queued judging.
If I am lucky enough to get 4 real 40+ point beers in my flight, there is one scenario where I'd seriously consider sending all 4 to mini-bos, but only as a last resort.
Lets say the first and last beers in the flight are the 2 vying for 3rd in my flight and they are tied or within a point. I may or may not want to send the 4 up, simply so that I can taste them FRESH side by side on the mini-bos panel. This is a pretty rare situation, but I would consider it if too much time has passed between the two 3rd place contenders, or, if I scored Beer A higher then B and my partner scored B higher than A but the two average scores were equal. This would only be for really high scoring beers, like 40+ 3rd place, never for a pair of 33s. The factor here is that they aren't within a window where a side by side of the original bottle would be a good comparison.
In a nutshell, the scenario is: two entries tied for 3rd with very high scores and a long gap between those beers in the flight so that one is now warm and flat, and the other is still cold and carbonated. I'd rather send them both up and let them fight it out while both are fresh, my rank be damned.