My oldest setter would do the same, take off on a fast quest so I bought an e-collar. Tried it on me and figured slightly below mid level would get her attention. Ended up, when she got an idea in her head even the top level wouldn't phase her.
Thinking it was not working at the higher levels, tried it on myself and found she was just determined and I was a wuss. I put it away after that and learned to accept the occasional long run and her being renamed dxxmmit.
