Avoid Vash with every character you have, nothing good comes of going there.

I still have a few teams to take from 81-85 and my plan is essentially do a zone with one team, then next, then next over and over. Will get repetetive doing the same quests so many times in a row but should also go faster each time as you don't need to think back to where to go or what to do in the same way you might if you went through 3-4 zones with a team before switching to the next set