75% Damage Reduction Tank Datacron Level 6 has 2 Bugs

Each damage reduction is being applied independently, to the damage of the attack. These examples all as if 1000 damage was going to be done. 

-75% Datacron applied=  750 less damage. 

-30% jabba lead applied= 300 less damage. 

1000-750-300=Minimum damage 1.

-90% Mon mothma lead assist when calling ability applies damage = 900 less damage.

-30% jabba lead applied= 300 less damage. 

1000-900-300=Minimum damage 1. (There would be an extra -750 here too if the tm is over 50%, but it makes no difference)

-45% Mon mothma lead assist when calling ability does not apply damage = 450 less damage. 

-30% jabba lead applied= 300 less damage. 

1000-450-300=250 damage. (Over 50% tm would give another -750 for 1 damage again)

You can decide for yourself how the maths should work, or you can look at the results and figure out how the maths actually works.

The Kyle katarn sabre throw in the video does damage in the first instance because kyle has jedi knight, so the first instance of damage gets +75% damage, canceling out the datacron reduction but the second instance does only one damage because krrsantan does not have the force influence debuff, so there is no +75% on that one.