Try trimming thier fur where the probes touch thier neck.My gsp LOVES to run but has learned that the collar is a good thing ,he gets to go out and play or hunt! He just has to listen. Try working with one dog at a time and gradually work with them both. If you don't want them chasing deer unfortunatly it sounds like you have to break them.Try it with a hide first.They have to learn deer are bad news, and listening to you is good news. If theynext to the hide,correction,come to you praise. This worked with my uncles german shep/lab when we would go on hikes.A light buzz is usually all it takes unless they are REALLY stuborn.Then take them on walks through the woods so they realize they have to listen all the time. I would work on a long lead and work on come and stay. Allways end training on a good note with something they can do, wether its sit or down, fetch ect.. Good Luck!