Thanks for everyones input.
And yes Hidden Farm we can't go bitless in dressage, and the owners had tried that with a hackamore going western, but he didn't respond well to it.
We have found a german silver french link eggbutt bit, that he seems to be ejoying. Instead of opening his mouth now constently he opens it at the beginning when warming up but starts chewing the bit and gets all drooley over it lol.
I have gone back to the beginning with him and getting contact on the reins slowly and releasing as soon as he gives and praising him and he is improving. I also don't over do it with him, he goes round with my riding with my seat into my hands and barely any contact, but we can't have slack reins. so we are working on finding the sweet spot were he is happy and i have consistend contact with him. He does not have any teeth problems, as we had the vet come out and check.
it seems to us that he was abused when he was broke, and had his mouth and tongue ripped open. this horse is sooo soft and subtle after warming up, that it is a shame that he opens his mouth and plays with his tongue out. he is so in tune with his rider and waits for cues.
Reflex - 13yr Reg. Swedish WB by Rubignon
Picasso - 11 months Reg. RPSI Clyde/TB