Soa is unkillable on a consistent basis because the bugs in the fight are totally random.
Last week, we fully cleared HM EV in about an hour, one shotting everything.
This week, we got to Soa in 45 minutes, then spent an hour wiping due to bugs before giving up.
That is unacceptable.
If you have good players that understand the strategy, you should know you're going to kill Soa. You should not be worrying that random bugs are going to cause you to wipe over and over again.