Venturing to dip my toes in the rabbit hole of what you just described... you were in a league where rewards are shared and then you went to an AE mission, (I'm assuming solo, but correct me if I am wrong), and you noticed the rewards were different? These numbers just aren't adding up for me. Could you answer some of my questions below?
How many members were in the league when you received that 29k XP for an Elite Boss defeat?
What level was that Elite Boss?
What level was your character that defeated the Elite Boss while ToTing?
How many members were in the AE mission when you received 38k XP for a Boss defeat?
What level was the AE content ran at? (Example, +4/x8 or +1/x4?)
What level was your character that defeated that Boss in the AE mission?
When you used your map in 'real world' scenario described above, how many members were in the AE mission when you received 78k XP for a Boss defeat?
What level was the AE content mentioned above ran at?
What level was your character that defeated the Boss in the AE mission?