i might buy a set of draw reins or a training fork to help my tn walker mix with her head set. she has a really bumpy ride.after i weaned her off of the tye down she did a little bit better then i did some more lunging work and stuff but she is still pretty bumpy and holds her head up higher than it needs to be. how do you attach the draw reins?ive never used them but i have heard good things about them. and also what size of training fork do i need the one that attaches to the cinch or breastcollar? or does it matter?