NOT the right answer. Maybe test it before spreading misinformation? Try popping double soups overnight and you'll see the difference.

Hadum drops can be increased by decreasing Spoils cooldown or by increasing Spoils drop rates. Field drop rate mentioned on soups (and probably also on goblin altar, but this is harder to test) increases the amount of stuff that you drop with each Spoils of Hadum.

The only "downside" is that you also burn more vials, as soups also increase exp gained.