Can't have more than 3 players up for corners

Overload set pieces slider only sends the keeper up sometimes right at the end of the game. Attacking focus doesn't work either.

It makes career mode unrealistic and in the last minutes when I'm losing in career mode or FUT it makes no sense having only 3 players in the box.

I've seen some people in ultimate team with more people in the box but no matter what settings I try no more than 3 will ever go up on corners for me.