Twin emperors warlock tank parsing

Getting green/blue Numbers for tanking twins does not feel faire.
epacially when u like to compete with your guild mades for the highest average number for the given raid night.
you are basically out of competition doing this task, when u are normaly aiming for 99%.
Maybe its not the intended way to use WCL for comperisons this way… but its how we like to do it in our Guild.
It should be treated the same way like real “tanking” classes, sperated form your DPS rankings