[RicyReetred]

If it is just drill, and not jigeiko, and someone is ducking their head out of the way, that is a pretty sure sign to me that you are hitting too hard and the person doesn't want to get hurt. Granted, the person could just be a putz, but I would ask them about it after practice. Maybe he doesn't feel right correcting you verbally or he feels too junior to give corrections, but he is definitely giving a very strong visual cue. Ask him and figure out why.