Solved

My car is slow this season

So, my league switched from 75% to 100% races this season, but it seems my car can't keep the same pace it had on previous seasons. It is slower than most other teams even on free practice. My drivers shouldn't be a problem as they're well trained.
I've seem other players with this issue on my league and I was wondering if designers could have some influence on car speed through the season apart from developing the next one's car?

Are there any managers in your league a higher level than you?

Seguro ahy otros manager mas altos que vos. Y el diseño influye a mi me toca ser el mas lento de la tabla

There are two or three lv12, but most of us are lv11

There are a lot of factors to really consider, it all depends on your management style or what kind of car design you are pursuing, or how your drivers compare to other teams' drivers, or your race strategies, etc.