agility, basic grids, running contacts - what to reward

First it´s basic grids, learning the dog to jump. Then it´s running contacts, what to do when the dog jumps or run in a wrong way. I want magi to hit at the bottom of the contact, i have made a red zone. In this movie i reward after the tunneln if the turn was good, i´t doesn´t matter if the contacts was bad. When the contact is good i reward after the dogwalk. i have picked out 3 bad and 1 good hit. I hope you can see what i mean.