It’s so frustrating when they make the mushroom battles more difficult. If anything they need to make event mushrooms easier, especially 4 star for giant event mushrooms.
@garlicsibling just asked about this in February. It used to take about 23,000 points to 3 star a normal event mushroom in January, now it takes over 30k? Why? And to 4 star a giant event mushroom is totally unattainable. You should be able to do it with 5 players that have strong squads.
IDK, maybe it doesn’t matter that much. I’m less likely to use a mushroom ticket if I can’t get good rewards so maybe I will not use so many anymore 
Also I tried to leave feedback via in app support about this and they have been unavailable. Others have been having this issue so I hope we aren’t loosing support for this game.