Okay, so I’m not new to eventing but it has been several years since I’ve done anything other than casual riding at home so I’m almost just starting over in retraining myself. Anyway, I got a new ottb last month. He’s very quiet and is adjustable at the walk/trot (canter still needs work) however I have little control over his shoulder. Circles are a struggle sometimes as he drops his shoulder and drifts out. His favorite places to drift are near the gate and also near the barn door. He does decent on the lunge line, even at the canter but we struggle under saddle. Is there something I am doing wrong and what exercises can I practice to help him use his body and get the correct bend so he doesn’t drift?
Note: He has been seen by massage, chiropractor, farrier, and dentist to rule out physical issues. I am also in contact with a trainer but due to scheduling I have not gotten any sessions with her yet.