There are 3 ways to look at farming for XP:
XP per FLAG
XP per LOOT TICKET
XP per TIME
My focus has changed to XP per TIME not so much because I need any more leveling or flags, but namely because it has been productive for my massive consumption of food/iron.
XP per TIME will be dependent on heroes/troops. I am bouncing between 1/17/1 and 3/1/3 HARD.
XP per FLAG and per TICKET, I evaluate in great detail here:
