I used to have a horse that i warmed up / tuned on in a dog bone snaffle with rope nose band, but ran him in a rubber mouthpiece pelham ( English ) bit. It worked for him. Now, I warm up and run in same bit. If I need to tune, I generally use something a little harsher just to get their attention and run in something lighter. I generally go with the less is more theory for bits, I want my horses to be working on their own and only have to help them on the backside. JMHO, hope that helps.