At 6'6" (78") you will fit into a Soulo (87"), but won't have much room left over. The photos show a 6'4" bag, so a 6'6" bag will fit. There's enough width for you, too, at about 30" wide at the ends and almost a foot more in the center. All Hillebergs are strong and the Soulo's materials and design are excellent. Ventilation wise, this tent has a major vent in the top which has a good deal of adjustment. The venting in the door is excellent and can be adapted to conditions.
I haven't done an actual time trial for setup, but would guess right now that I'm in the 4 minute range (without racing). Much of the total time will depend upon how many stakes are used. Unfortunately I haven't had enough snow to fully test it, but see no reason to doubt that it will stand up to any amount that's thrown at it. The chances of fitting anyone/anything (except maybe a small dog named Lady) in there with you are slim.
The double summit lidded LBP on the McHale site is basically identical to mine (not mine), but I don't have the utility pocket (at least yet). I also strongly considered going with a kangaroo pocket and a single layer summit flap. The quoted price is quite accurate. The pack, as I have it is around $750 but shipping for the demo and then for the final pack boosted that up to around $780. I believe that that price would be the same up to a 38". It was tempting to go slightly bigger initially, but then I would have been edgeing toward a bigger pack. BTW, I can just (barely) fit a Monbell SS #0 in a tight compression sack into the bottom of the 36" horizontally. As a side note, the Crest pocket in regular size is one of the biggest hip belt pockets I've ever seen and will hold all my items easily.
Good luck in choosing options. The mind boggles just thinking about them.