Economic Changes?

Hello guys, since around a month i noticed almost no income in terms of XP on my Vehicles, i play 12.0 Britain, get ~10K XP per match but only get like 1K added to the OSA SPAA, yes i did check if if i have a ResearchBottleneck, but in theory i shouldnt have one
Please tell me about Changes that i missed or something that happens if you reach toptier (first tech tree at Rank VIII)

If you research rank 7 with rank 8 vehicles, you get only 90% efficiency.

Did your premium time expire?

Do you use air much?

Post a screenshot from the debriefing screen!

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My Premium time didnt expire, and no i almost ever play air battles