I mean enemy setup changes every time your CAL is changed. Sometimes it leads to bad setups, sometimes to easy ones.
Bad setup can give much bigger disadvantage than 10% less enemies boost you get from 900 SBS.
It doesn't linked to this update, just you was unlucky enough to get worse setups than it was before. But you can try to overcome that by researching some tech or placing normal expansion.
My beta city does not have an excessive amount of expansions. It basically is a low-key, low intensity city that I keep active but do not play real hard. Though I have bought some premium expansions in the past it's nothing major. And I still have 2 unplaced research expansions I haven't really needed yet.
SBS is 877 this week.
Getting a bad set-up in opposing forces once in a while is something one can expect. However, that is happening WAY more often since the change. As in at least half the encounters on the 2nd floor, EVERY WEEK since the change.
Before the change I was able to do 2 floors every week, mostly on autofight, except the last 4 or 8 encounters of the 2nd floor, which I would usually do manually, but all without having to place military boosterbuildings and usually without needing the Firebird, although I would use the bird if it coincided with the tourney.
Now, even with the firebird AND fighting the entire 2nd floor manually I have way heavier losses every week than before. So it is not 'a bad set-up once in a while', it seems to be a structural thing for me.
Since it is a low-key city, there haven't been real changes or progression in tech advances either, so no real CAL changes that would explain this. The tech is slow, as I only check in once or twice a day and because of the Spire I now am doing less in the tourney, meaning fewer KPs for tech-research.
My troops have been literally decimated over the last few weeks due to the Spire. So, if this doesn't change, I just will forget about the damn Spire as it is not worth it.