When I was experimenting with bits, I tried one like that last one you pictured. My horse loved playing with the middle piece so much, he didn't want me to take it out of his mouth. Unfortunately it's not legal in eventing, so I ended up with a snaffle with a middle lozenge piece. If those are all legal in your discipline, either one with the copper roller piece would probably encourage a softer jaw.
You just have to see your distance...you don't have to like it.