Field trial dogs are expected to quarter the ground they are on immediately in front of the handler and not skip the less interesting stuff and they get marked accordingly, dogs that are just worked and shot over tend to skip the boring bits especially on ground they know well, I would say try to get your pup to quarter the ground in front of you this helps train the pup to keep close in.
One of the problems I have is Teal knows where the rabbits are and will run between the likely bits of cover as she knows the ground so I have to keep on top of her with the whistle to stop her going out to far.
To be honest all of my dogs have ranged much to far and would be out of any field trial with in minutes but when you are a lone gun on ground that does not hold much game you need a dog that will not waste time hunting scentless areas.