Originally Posted by
Rongway
While it doesn't deal any damage, Flash generates the enmity of a 1200 potency attack before accounting for tank stance, and is affected by status effects that affect magical damage. Unleash and Overpower have enmity multipliers that make them generate the enmity of 1300 and 1030 potency attacks, respectively. Current tank stance gives potency*1.7enmityBonus*0.8damagePenalty, so effectively a 1.36x multiplier.
Other "increased enmity" actions have individual multipliers ranging from 5x to 7x.
For ShB actions in tank stance to generate comparable enmity to pre-ShB increased enmity actions in tank stance, the tank stance multiplier would need to be about 6x to 9x. Of course, something on the higher end of this range is probably overkill, as it would assume a current tank is doing nothing but enmity combos and living in tank stance, neither of which is true. 5x~6x would probably be enough.