Problem 1: His circles on the lunge are more like eggs. He always goes wide in one particular corner and ends up pulling so hard his body goes out and his head turns in and he stops and looks at me. This happens when we start at the trot but does get better with repetition.
Problem 2: On the lunge, when he stops and looks at me in the corner, often he will change direction, as if this was taught. I know some train this but I don't. I have the lunge line threaded through the near side of bit, over the poll and attached to the opposite side of bit. So change in direction is never automatic for me.
Problem 3: Because of his habit on the lunge with corner, even if I do get him into a canter, he never makes it around a whole circle because he pulls out.
Problem 4: he is half arab and appears to be quite comfortable with extended trot so getting him to canter regardless is difficult.
I have tried asking for canter while riding. This just doesn't work. He gets frustrated and just continues with faster or extended trot so I'm ideally trying to teach on the ground and also to teach by verbal cues.