Right now he's ridden in a very thick loose ring snaffle. I know thickness spreads the pressure out evenly, but does it make the aids less refined as well? Here are some bits I'm currently looking at:
Happy Mouth Shaped Mullen Mouth Loose Ring Snaffle Bit | Dover Saddlery
Copper 1/4 Moon Eggbutt Bit | Dover Saddlery
JP Korsteel Oval Mouth Loose Ring Snaffle Bit | Dover Saddlery
I definitely want to try a double jointed bit. Out of these, which ones would you suggest?