I know, I know, this isn't "76-80," but considering I still don't see an 80-85 board, I figured I may as well throw it up here.
(1) If you can't do it yourself, either make friends with or bankroll someone who can help you do SoD progression. Getting up in voids not only opens up new spells, but is also required for making the group gear that you'll start seeing in Field of Scale, and lets you hire stronger mercs.
(2) Don't feel constrained to hotzones or SoD zones. From what I've seen so far (about halfway through 84), Beza XP is about even with everything equal to or lower than chain pulling mobs in Field of Scale, and -- most importantly -- absolutely destroys Vald's XP rate for minimal extra effort (mobs have approx 10k more HP).
(3) If you two-box, duo the new Ancient Heroes missions. Not only do you get significantly more Brews since you aren't rolling other people for them, it's also absurdly easy XP -- once you get efficient at it, you're looking at roughly an hour's worth of work per task, each of which gives you about 4.5% regular XP at 84 -- and it's affected by Lesson. N.B.: If you're starting to do this early in the levelling process, it's strongly in your best interest to sell chest drops immediately instead of holding onto them for when you hit 85. Since they're lore, if you end up with both of your toons with the items, you're basically wasting Brews if it drops again.
All I could think of at the moment, but then, I'm at work. I'll throw up some "you can comfortably do X at Y gear level" stuff when I get home tonight. Others feel free to contribute.