What has helped me, is find well used trails and if they have somenice big tracks mixed in with the smaller ones, there is probably a buck using it. If your seeing the dew claw imprints with the track it is usualy a heavier deer, chances are its a buck. you might be getting bucks walking past the camera after it has taken a doe pics and is in the time out between frames.
might help, might not, but i hope it does.
Dan