According to videos and known tactics, the shields on the eggs go away at 40% of Sinestra’s mana.
We are noticing that we can get her all the way down to 5% mana rather quickly, and then it’s still a good 10 seconds before the eggs are vulnerable. On the second egg, she suddenly heals much more mana during the damaging part and we barely get around 30-40%.
Even then, the egg remaining doesn’t get his shield lifted unless we keep her below 30% mana.
Something is clearly wrong with this fight.