So long as you are receiving instruction, you must leave your ego behind and leave everything to your teacher. If you simply cannot follow your teacher, you should respectfully take your leave of him. The teaching of kyujutsu changes depending on the physical and mental attributes of the student. Correcting your shooting based upon what you see in another's shooting is something that comes only after you have become very advanced. Copying other people will destroy the order of learning and is the cause of failure.
Proper training is a slow process.
The kind of archery that is learned by copying what you see at a local archery range is, after all is said and done, nothing more than that. It means that two hundred shots done carelessly are inferior to two shots done with care, and two shots done with care are superior to two hundred shots done carelessly. Among those who practice, there are those who want to cavalierly shoot a lot of arrows and those who are lazy and want to shoot as little as possible. If you want to become skillful, you should shoot more than one hundred arrows every day, day after day. You must not make the mistake of thinking that shooting carefully means to experiment at random.