Blizzard has announced Delve Tuning hotfixes that just went live which reduces the damage scaling of mobs while in a group.

HOTFIXES
September 12, 2024

Delves

Fixed a bug causing bosses to scale incorrectly with more players.

Increased the health scaling of enemies in Delves while grouped with other players.

Reduced the damage scaling of many enemy abilities in Delves while grouped with other players.

Adjusted enemy targeting preferences in Delves.

Developers’ notes:

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