There is another mechanism active, preventing/punishing trophy dumpers. Let me explain what I mean.
After last ninja event, I opened my base for half a day to give members (plus others) the opportunity to get gold. I closed my base around 1950 trophies. During war season, I deliberately kept my trophies low, with exception of the last two days. In version 3.8 I started to raise my trophies and they went up pretty fast, between 40-55 trophies per raid and I stopped around 2900 trophies. Then I upgraded version to release 3.9.
What a difference, I really struggled to raise my trophies up to 3500. This morning an even harder struggle to get it above 3600. I agree that trophy dumpers (like me ) should have a hard time to regain trophies, but this difference of working hard to gain 10-15 trophies per raid is a little bit too much. Match maker suddenly started to give players having boosts that only teams 56+ can have, including all pro boosts. With farm gear it’s not easy to beat those players, so some I skipped.
I did want to try to raise my trophies up to 4k, but this time there was no way I could have accomplished it. Next time I better don’t dump that many trophies .
This is something I miss in the list of changes.