Why 2 Players matches has less grip and more slick cars than One player matches

Many times we do live battles in the same place, so we go to 2 players matches, the problem is that same cars, same tracks, same settings we used to do in one player matches but horrible control in 2 players matches.
The evidence is lap time record since cars are very easy to turn around, control is horrible.
Note that I race without any assists and i am always among top 600 player, so … i have experience and i can very clear the difference.

Anyone has solution?