I agree with Kayty. Also remember you are never holding the horses head down, every stride you must refresh the contact. Use more feel in your fingers and drive from your seat forward through your hand to the bit to maintain and refresh the contact.
As another poster mentioned, it is possible to so severely injure a horse with draw reins, dugougs, etc... to the point where the horse must be humanely euthanised. So they are not a tool to be taken lightly. Personally I have never found a use for them on any horse I've ridden.
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