I was the one that created the other thread, and yes, the devs stated it will not change, and locked it right after.
I've defeated it on multiple occasions, but the only way is to go passive and fly with your eyes, attempting to sneak up on it. After that, you gotta try and kill it before it runs back to its base or cap point turrets, which when talking about other Sulla variants, takes a very long time to kill.
We don't need to adjust the Shiva E, as long as we can get an ASF variant that can kill it quicker. Not talking instagib here, like another Shiva E would do, but maybe perhaps a Sulla with 4 LBX-5s?