Do you have some C2 S1 at 75+20 ?
For me it is opposite, I get attack only about 50% of the 184th tournament.
Overall, it is about auto-fill team power. The C2 S1 have a big jump in auto-fill team power. Since I don’t have any C2, the different between my auto-fill team power and maximum auto-fill team power get larger, so I get less attack. However, the effect seem to be stronger than I expect 
.