Turns are tricky. If you enter too fast, you're likely to go wide. If you grab front brake and the bike "stands up", you're likely to go wide. If you try to add more speed, you're likely to go wide. What CAN you do?

The typical answer, short of "don't get into this situation in the first place," is to apply just enough brake to slow the bike and cause it to "fall" deeper into the turn.