Confusing XP Boosts

I did Heroic FF and got 16K XP on Legendary WZ Boosts.
Then did Legendary FF and only got 17K XP even from first place? Only 1K more?
My XP Jackpot did better than that coughing up 20K+ XP at random!!! At min
I was thinking it’ll kick back at least 18K-19K for the legendary effort.

There are more factors that go into your final XP amount such as duration of the match and whether or not you completed every round.

That is because the jackpots are randomized XP rewards, at least according to their description. Not sure if the regular boost are tired to a specific match formula but jackpots can grant a lot or sometimes not much.

xp leg = 20 000 or 24 000 xp in warzone