Get into see an expert and ensure the bow is tuned (Jimbo at Jim's bow will do just fine from what I here). Many small little things need to be in order for correct arrow flight. Everything makes a difference. Perhaps call Jim and set up an appointment/lesson on things your doing correct/wrong.
Other suggestion is to join a club (or go to a range on club shooting night) and ask other experienced archers to watch you (and your form) and to give suggestion. I'm sureyou'lll have no problems getting volunteers.
3" groups at 30 yards is "OK" but I'd want to be touching arrows by the time September 3rd comes around.
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