3)It's hardly RNG with large pulls. Shield Swiping the Vuln. Down/Splash mobs in Pharos (when that was somewhat difficult to do in the first pull) made an impossible pull possible. With WARs, you get the benefit of higher damage output from the tank, so the net result is roughly the same time in the dungeon.
4)by managing aggro I more mean making sure every enemy is hit as you keep running to get more. If an enemy only has prox aggro, a healer re-stoneskinning or casting e4e o nyou will draw aggro. As for during the pull though, I'd say it's more interesting to manage aggro and give yourself room to 1-2-3 things to get debuffs up on them than it is doing single pulls.