With criswolf09's alongside testing, we discovered the following bug:
Ego Blade Breach applies it's Paranormal Damage Buff separately to it's dual bladed version 'Id Blade Breach'.
This means that both buffs can be stacked past the intended 3 stacks based on the number of players attacking a single target:
Example: criswolf and I managed to apply up to six stacks of each debuff by ourselves. This worked effectively to amplify the damage.
Below is a picture of the both debuffs stacked side by side by my character. Each stack could go beyond 3 stacks maximum with another player involved: @kaizerin